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Dell Pro Tower QCT1250 Owner's Manual
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Dell Pro Tower QCT1250 Owner's Manual

Dell Pro Tower QCT1250 Owner's Manual

Regulatory type: d34m002/d34m003
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Dell Pro Tower
QCT1250
Owner's Manual
Regulatory Model: D34M
Regulatory Type: D34M002/D34M003
March 2025
Rev. A00

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Summary of Contents for Dell Pro Tower QCT1250

  • Page 1 Dell Pro Tower QCT1250 Owner's Manual Regulatory Model: D34M Regulatory Type: D34M002/D34M003 March 2025 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2025 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.
  • Page 3 Contents Chapter 1: Views of Dell Pro Tower QCT1250................. 7 Front....................................... 7 Back......................................8 Back panel..................................... 9 Top......................................11 Chapter 2: Set up your computer....................12 Chapter 3: Specifications of Dell Pro Tower QCT1250..............16 Dimensions and weight..............................16 Processor..................................... 16 Chipset....................................18...
  • Page 4 Chapter 5: Cable cover........................ 34 Removing the cable cover...............................34 Installing the cable cover..............................34 Chapter 6: Left-side cover......................36 Removing the left-side cover............................36 Installing the left-side cover............................37 Chapter 7: Coin-cell battery cover....................40 Removing the coin-cell battery cover.......................... 40 Installing the coin-cell battery cover..........................40 Chapter 8: Coin-cell battery......................
  • Page 5 Removing the hard drive............................69 Installing the hard drive..............................70 Intrusion switch..................................72 Removing the intrusion switch..........................72 Installing the intrusion switch........................... 73 Power button..................................74 Removing the power button............................. 74 Installing the power button............................74 Fan shroud..................................76 Removing the fan shroud............................76 Installing the fan shroud.............................76 External port (optional module).............................
  • Page 6 Deleting or changing an existing system password or setup password............124 Clearing CMOS settings..............................124 Clearing system and setup passwords........................125 Chapter 13: Troubleshooting...................... 126 Dell SupportAssist Pre-boot System Performance Check diagnostics.............. 126 Running the SupportAssist Pre-Boot System Performance Check.............. 126 Power-Supply Unit Built-in Self-Test ........................126 System-diagnostic lights..............................126 Recovering the operating system..........................
  • Page 7 Views of Dell Pro Tower QCT1250 Front Figure 1. Front view of Dell Pro Tower QCT1250 1. Power button with diagnostic LED Press to turn on the computer if it is turned off, in sleep state, or in hibernate state.
  • Page 8 Connect devices such as external storage devices and printers. Provides data transfer speeds of up to 5 Gbps. 6. Slim optical drive (optional) Reads from and writes to CDs and DVDs. Back Figure 2. Back view of Dell Pro Tower QCT1250 1. Back panel Connect USB, audio, video, and other devices. 2. Full-height PCIe x1 slot Connect a PCI-Express card such as an audio, or network card to enhance the capabilities of your computer.
  • Page 9 Connect a security cable to prevent unauthorized movement of your computer. 8. Service Tag label The Service Tag is a unique alphanumeric identifier that enables Dell service technicians to identify the hardware components in your computer and access warranty information.
  • Page 10 5120 x 3200 at 60 Hz with a Type-C to DisplayPort adapter. 7. Legacy serial port (optional) Connect a peripheral or device to the RS-232 serial port. Views of Dell Pro Tower QCT1250...
  • Page 11 Figure 4. Top view of Dell Pro Tower QCT1250 1. MyDell QR code MyDell is your hub for content personalized to your Dell Pro Tower QCT1250, including videos, articles, manuals, and easy access to support. Views of Dell Pro Tower QCT1250...
  • Page 12 Set up your computer Steps 1. Connect the keyboard and mouse. NOTE: For setup instructions, see the documentation that is shipped with the keyboard and mouse. Figure 5. Connecting the keyboard and mouse 2. Connect to your network using a cable, or connect to a wireless network. Set up your computer...
  • Page 13 Figure 6. Connecting the network cable 3. Connect the display. NOTE: For improved graphical performance, connect the display to the display ports on the discrete graphics processing unit. Figure 7. Connecting the display 4. Connect the power cable. Set up your computer...
  • Page 14 Figure 9. Pressing the power button 6. Finish the operating system setup. For Ubuntu: Follow the on-screen instructions to complete the setup. For more information about installing and configuring Ubuntu, search in the Knowledge Base Resource at Dell Support Site. Set up your computer...
  • Page 15 For Windows: Follow the on-screen instructions to complete the setup. When setting up, Dell Technologies recommends that you: ● Connect to a network for Windows updates. NOTE: If connecting to a secured wireless network, enter the password for the wireless network access when prompted.
  • Page 16 The weight of your computer depends on the ● Maximum: 6.78 kg (14.95 lb) configuration ordered and manufacturing variability. Processor The following table lists the details of the processors that are supported on your Dell Pro Tower QCT1250. Specifications of Dell Pro Tower QCT1250...
  • Page 17 Processor type Intel Core Ultra 5 235 Intel Core Ultra 5 245 Intel Core Ultra 7 265 Processor wattage 65 W 65 W 65 W Processor total core count Performance-cores Efficient-cores Processor total thread counts Specifications of Dell Pro Tower QCT1250...
  • Page 18 Tera Operations Per Second (TOPS) is an AI performance metric that measures how many trillions of operations per second an AI processor can perform. Chipset The following table lists the details of the chipset that is supported by your Dell Pro Tower QCT1250. Table 5. Chipset  Description...
  • Page 19 Memory The following table lists the memory specifications that are supported by your Dell Pro Tower QCT1250. Table 6. Memory specifications  Description Values Memory slots Two UDIMM slots Memory type DDR5 Memory speed ● Up to 4800 MT/s ● Up to 5600 MT/s ●...
  • Page 20 The following table lists the external ports that are supported on the optional module slot for Dell Pro Tower QCT1250. NOTE: The ports that are listed in this table are mutually exclusive. Your Dell Pro Tower QCT1250 can only support one of the listed options.
  • Page 21 PCIe ● One full-height PCIe x16 slot ● Two full-height PCIe x1 slots Ethernet The following table lists the wired Ethernet Local Area Network (LAN) specifications of your Dell Pro Tower QCT1250. Table 10. Ethernet specifications  Description Values Model...
  • Page 22 Your Dell Pro Tower QCT1250 supports a combination of the following storage configurations: ● One 3.5-inch hard drive ● One M.2 2230/2280 solid-state drive The primary drive of your Dell Pro Tower QCT1250 is the M.2 solid-state drive. Table 13. Storage specifications  Storage type...
  • Page 23 ● Two 4-pin connectors for processor ● One 8-pin connector for system board ● One 8-pin connector for graphic card GPU—Integrated The following table lists the specifications of the integrated Graphics Processing Unit (GPU) supported by your Dell Pro Tower QCT1250. Table 16. GPU—Integrated  Controller...
  • Page 24 60 Hz 60 Hz resoluti on— quadrup le MST GPU—Discrete The following table lists the specifications of the discrete Graphics Processing Unit (GPU) supported by your Dell Pro Tower QCT1250. Table 18. GPU—Discrete  Controller External display support Memory size Memory type AMD Radeon RX 6300 Two DisplayPort 1.4a (HBR2)
  • Page 25 Microsoft 10 Device Guard and Credential Guard (Enterprise SKU) Microsoft Windows BitLocker Padlock ring SafeBIOS: includes Dell Off-host BIOS Verification, BIOS Resilience, BIOS Recovery, and additional BIOS Controls SafeID including Trusted Platform Module (TPM) 2.0 Self-encrypting storage drives (Opal, FIPS)
  • Page 26 Table 21. Regulatory compliance (continued) Regulatory compliance Responsible Business Alliance policy Operating and storage environment This table lists the operating and storage specifications of your Dell Pro Tower QCT1250. Airborne contaminant level: G1 as defined by ISA-S71.04-1985 Table 22. Computer environment  Description...
  • Page 27 You should only perform troubleshooting and repairs as authorized or directed by the Dell technical support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that are shipped with the product or at Dell Regulatory Compliance Home Page.
  • Page 28 Standby power Dell products with standby power must be unplugged before you open the back cover. Systems that are equipped with standby power are powered while turned off. The internal power enables the computer to be remotely turned on (Wake-on-LAN) and suspended into a sleep mode and has other advanced power management features.
  • Page 29 NOTE: It is recommended to always use the traditional wired ESD grounding wrist strap and protective anti-static mat when servicing Dell products. In addition, it is critical to keep sensitive parts separate from all insulator parts while servicing the computer.
  • Page 30 Transporting sensitive components When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport. Lifting equipment Adhere to the following guidelines when lifting heavy equipment: CAUTION: Do not lift greater than 50 pounds.
  • Page 31 Screw list NOTE: When removing screws from a component, it is recommended to note the screw type and the quantity of screws, and then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is restored when the component is replaced.
  • Page 32 Major components of Dell Pro Tower QCT1250 The following image shows the major components of Dell Pro Tower QCT1250. Figure 10. Major Components of Dell Pro Tower QCT1250 1. Left-side cover 2. Graphics card 3. Processor Working inside your computer...
  • Page 33 NOTE: Dell Technologies provides a list of components and their part numbers for the original system configuration purchased. These parts are available according to warranty coverages purchased by the customer. Contact your Dell sales representative for purchase options. Working inside your computer...
  • Page 34 Cable cover Removing the cable cover Prerequisites 1. Follow the procedure in Before working inside your computer. About this task The following image indicates the location of the cable cover and provides a visual representation of the removal procedure. Figure 11. Removing the cable cover Steps 1.
  • Page 35 Figure 12. Installing the cable cover Steps 1. Align the tabs on the cable cover to the slots on the back of the chassis. 2. Insert the tabs on the cable cover into the slots on the back of the chassis and slide downwards. 3.
  • Page 36 Left-side cover Removing the left-side cover Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. About this task The following images indicate the location of the left-side cover and provide a visual representation of the removal procedure. Figure 13.
  • Page 37 Figure 14. Removing the left-side cover Steps 1. Place the computer on its side with the left-side facing up. 2. Remove the two screws (6-32#) that secure the left-side cover to the chassis. 3. Hold the tab on the left-side cover firmly, then slide and remove the left-side cover from the chassis. Installing the left-side cover Prerequisites If you are replacing a component, remove the existing component before performing the installation process.
  • Page 38 Figure 15. Installing the left-side cover Figure 16. Installing the left-side cover Left-side cover...
  • Page 39 Steps 1. Hold the left-side cover firmly on both sides, then slide it into the chassis towards the front of the computer. 2. Replace the two screws (6-32#) that secure the left-side cover to the chassis. 3. Place the computer in an upright position. Next steps 1.
  • Page 40 Coin-cell battery cover Removing the coin-cell battery cover Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. About this task The following image indicates the location of the coin-cell battery cover and provides a visual representation of the removal procedure.
  • Page 41 About this task The following image indicates the location of the coin-cell battery cover and provides a visual representation of the installation procedure. Figure 18. Installing the coin-cell battery cover Steps Align the coin-cell battery cover with the battery socket (RTC) and press it into place. Next steps 1.
  • Page 42 Coin-cell battery Removing the coin-cell battery Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. 5. Remove the coin-cell battery cover.
  • Page 43 About this task The following image indicates the location of the coin-cell battery and provides a visual representation of the installation procedure. Figure 20. Installing the coin-cell battery Steps With the positive side (+) facing up, insert the coin-cell battery into the battery socket (RTC) on the system board and snap the battery into place.
  • Page 44 Removing and installing Customer Replaceable Units (CRUs) The replaceable components in this chapter are Customer Replaceable Units (CRUs). CAUTION: Customers can replace only the Customer Replaceable Units (CRUs) following the safety precautions and replacement procedures. NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Dust filter Removing the dust filter Prerequisites...
  • Page 45 2. Remove the dust filter from the chassis. Installing the dust filter Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image indicates the location of the dust filter and provides a visual representation of the installation procedure. Figure 22.
  • Page 46 About this task The following image indicates the location of the front cover and provides a visual representation of the removal procedure. Figure 23. Removing the front cover Steps 1. Gently pry and release the tabs that secure the front-cover to the chassis. 2.
  • Page 47 Figure 24. Installing the front cover Steps 1. Align and insert the front-cover tabs into the slots on the right side of the chassis. 2. Rotate the front cover towards the chassis and press it into place. Next steps 1. Install the left-side cover.
  • Page 48 Figure 25. Removing the internal speaker Steps 1. Disconnect the internal-speaker cable from its connector (INT SPKR) on the system board. 2. Remove the internal-speaker cable from the routing guide on the chassis. 3. Slide and remove the internal speaker from the chassis. Installing the internal speaker Prerequisites If you are replacing a component, remove the existing component before performing the installation process.
  • Page 49 Figure 26. Installing the internal speaker Steps 1. Place and slide the internal speaker into the bracket on the chassis. 2. Route the internal-speaker cable through the routing guide on the chassis. 3. Connect the internal-speaker cable to its connector (INT SPKR) on the system board. Next steps 1.
  • Page 50 CAUTION: To prevent damage to the memory module, hold the memory module by the edges. Do not touch the components or metallic contacts on the memory module as electrostatic discharge (ESD) can inflict severe damage on the components. To read more about ESD protection, see protection.
  • Page 51 Figure 28. Installing the memory Steps 1. Align the notch on the memory module with the tab on the memory-module slot (DIMM1/DIMM2). 2. Insert the memory module into the memory-module slot. 3. Press down on the memory module until the securing clips lock in place. NOTE: Repeat steps 1 to 3 for each memory module to be installed on your computer.
  • Page 52 Figure 29. Removing the M.2 2230 solid-state drive Steps 1. Remove the screw (M2x3.5) that secures the solid-state drive to the system board. 2. Slide and lift the solid-state drive from the M.2 solid-state drive slot (M.2 PCIe SSD - 0) on the system board. Installing the M.2 2230 solid-state drive Prerequisites If you are replacing a component, remove the existing component before performing the installation process.
  • Page 53 Figure 30. Installing the M.2 2230 solid-state drive Steps 1. Align the notch on the solid-state drive with the tab on the M.2 solid-state drive slot (M.2 PCIe SSD - 0). 2. Slide the solid-state drive into the slot on the system board. 3.
  • Page 54 Figure 31. Removing the M.2 2280 solid-state drive Steps 1. Remove the screw (M2x3) that secures the solid-state drive to the system board. 2. Slide and lift the solid-state drive from the M.2 solid-state drive slot (M.2 PCIe SSD - 0) on the system board. Installing the M.2 2280 solid-state drive Prerequisites If you are replacing a component, remove the existing component before performing the installation process.
  • Page 55 Figure 32. Installing the M.2 2280 solid-state drive Steps 1. Align the notch on the solid-state drive with the tab on the M.2 solid-state drive slot (M.2 PCIe SSD - 0). 2. Slide the solid-state drive into the slot on the system board. 3.
  • Page 56 Figure 33. Moving the solid-state screw mount on M.2 slot 0 Steps 1. Remove the screw mount on the system board. 2. Install the screw mount on the system board. Next steps 1. Install the M.2 2230 solid-state drive, or the M.2 2280 solid-state drive, whichever is applicable.
  • Page 57 Figure 34. Removing the graphics card Steps 1. Lift the tab to open the card-retention bracket. 2. Push and hold the securing tab on the PCIe x16 slot (SLOT2), releasing the graphics card from the slot. 3. Lift the graphics card off the system board. Installing the graphics card Prerequisites If you are replacing a component, remove the existing component before performing the installation process.
  • Page 58 Figure 35. Installing the graphics card Steps 1. Lift the tab to open the card-retention bracket. 2. Remove the PCIe blanking plate from the chassis. NOTE: Step 1 and 2 is only applicable when installing a graphics card for a computer that did not have a graphics card previously installed.
  • Page 59 Wireless card Removing the wireless card Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. About this task The following image indicates the location of the wireless card and provides a visual representation of the removal procedure. Figure 36.
  • Page 60 Installing the wireless card Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task NOTE: You may install either a M.2 2230 or 2280 solid-state drive into the M.2 solid-state drive slot (TBD) on the system board.
  • Page 61 3. Align the notch on the wireless card with the tab on the wireless-card slot (M.2 WLAN) on the system board. 4. Slide the wireless card at an angle into the wireless-card slot. 5. Replace the screw (M2x3.5) that secures the wireless card to the system board. Next steps 1.
  • Page 62 Figure 38. Removing the optical drive Removing and installing Customer Replaceable Units (CRUs)
  • Page 63 Figure 39. Removing the optical drive Steps 1. Disconnect the power and power cables from the optical drive. 2. Press down on the securing tab to release the optical drive from the drive bay. 3. Pull to slide out the optical drive from the drive bay. 4.
  • Page 64 Figure 40. Installing the optical drive Removing and installing Customer Replaceable Units (CRUs)
  • Page 65 Figure 41. Installing the optical drive Steps 1. Align the tabs on the optical-drive bezel with the slots on the optical drive. 2. Press down on the optical-drive bezel until it clicks into place. 3. Align the post on the optical-drive bracket to the slot on the optical-drive. 4.
  • Page 66 4. Remove the left-side cover. 5. Remove the front cover. About this task The following images indicate the location of the drive bay and provide a visual representation of the removal procedure. Figure 42. Removing the drive bay Removing and installing Customer Replaceable Units (CRUs)
  • Page 67 Figure 43. Removing the drive bay Steps 1. Disconnect the optical-drive data and power cables from the optical drive. 2. Remove the optical-drive data and power cables from the routing guide on the drive bay. 3. Disconnect the hard-drive data and power cables from the hard drive. 4.
  • Page 68 Figure 44. Installing the drive bay Figure 45. Installing the drive bay Steps 1. Holding the drive bay firmly with both hands, then slide and secure one side of the drive bay to the chassis. Removing and installing Customer Replaceable Units (CRUs)
  • Page 69 2. Press down the other end of the drive bay securing the tabs on the drive bay with the slots on the chassis. 3. Connect the hard-drive data cable and power cables to the hard drive. 4. Connect the optical-drive data cable and power cables to the optical drive. 5.
  • Page 70 Figure 46. Removing the hard drive Steps 1. Flip over the drive bay. 2. Press the securing tab to release the hard drive from the drive bay. 3. Slide and lift the hard drive at an angle off the drive bay. 4.
  • Page 71 Figure 47. Installing the hard drive Steps 1. Replace the four screws (6-32#) on the hard drive. 2. Align the screws on the hard drive with the grooves on the drive bay and slide the hard drive into place. 3. Press down on the hard drive until it clicks into place. 4.
  • Page 72 Intrusion switch Removing the intrusion switch Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. 5. Remove the front cover.
  • Page 73 Installing the intrusion switch Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image indicates the location of the intrusion switch and provides a visual representation of the installation procedure.
  • Page 74 Power button Removing the power button Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. 5. Remove the front cover.
  • Page 75 About this task The following image indicates the location of the power button and provides a visual representation of the installation procedure. Figure 51. Installing the power button Steps 1. Thread the power-button module cable through the slot on the front of the chassis. 2.
  • Page 76 Fan shroud Removing the fan shroud Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. 5. Remove the front cover.
  • Page 77 Figure 53. Image: Installing the fan shroud Steps 1. Place the fan shroud on the fan and heat-sink assembly. 2. Press the fan shroud against the fan and heat sink assembly to snap the fan shroud in place. Next steps 1.
  • Page 78 About this task NOTE: The procedure to remove the optional-port module is the same for all the different optional ports that may be installed on your computer. The following image indicates the location of the optional-port module and provides a visual representation of the removal procedure.
  • Page 79 Figure 55. Installing the optional-port module Figure 56. Installing the optional-port module Steps 1. Using a screw driver, push against the optional-port cover until it comes off. Removing and installing Customer Replaceable Units (CRUs)
  • Page 80 NOTE: This step is only applicable if you are installing the optional-port module on a computer that did not previously have it installed. 2. Place the expansion-port module at an angle and align the tabs on the module to the slots on the chassis. 3.
  • Page 81 Figure 57. Removing the serial-port module Steps 1. Remove the two screws (M3) that secure the optional serial module to the chassis. 2. Push the serial port through its slot on the chassis. 3. Disconnect the serial-port module cable from the connector (KB MS SERIAL) on the system board. 4.
  • Page 82 Figure 58. Installing the serial-port module Removing and installing Customer Replaceable Units (CRUs)
  • Page 83 Figure 59. Installing the serial-port module Steps 1. Using a screw driver, push against the serial-port cover until it comes off. 2. Remove the two screws (M3) on the serial-port module. NOTE: Steps 1 and 2 are only applicable if you are installing the serial-port module on a computer that did not previously have it installed.
  • Page 84 The information in this removing and installing FRUs section is intended for authorized service technicians only. CAUTION: To avoid any potential damage to the component or loss of data, Dell Technologies recommends that an authorized service technician replaces the Field Replaceable Units (FRUs). CAUTION: Your warranty does not cover damages that may occur during FRU repairs that are not authorized by Dell Technologies.
  • Page 85 Figure 60. Removing the antenna modules Steps 1. Remove the antenna cables from the routing guide on the chassis. 2. Remove the screw (6-32#) that secures the antenna modules to the chassis. 3. Thread the antenna cables through the slot on the chassis. 4.
  • Page 86 Figure 61. Installing the antenna modules Steps 1. Thread the antenna cables through the slot on the chassis. 2. Place the antenna modules on the chassis. 3. Align the screw hole on the antenna modules with the screw hole on the chassis. 4.
  • Page 87 Power-supply unit Removing the power-supply unit Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable. 4. Remove the left-side cover. 5. Remove the front cover.
  • Page 88 Figure 62. Removing the power-supply unit Removing and installing Field Replaceable Units (FRUs)
  • Page 89 Figure 63. Removing the power-supply unit Steps 1. Press the securing clip and disconnect the processor-power cable from its connector (ATX CPU1) on the system board. 2. Remove the processor-power cable from the routing guides on the chassis. 3. Press the securing clip and disconnect the system-board power cable from its connector (ATX SYS) on the system board. 4.
  • Page 90 Figure 64. Installing the power-supply unit Removing and installing Field Replaceable Units (FRUs)
  • Page 91 Figure 65. Installing the power-supply unit Steps 1. Place and slide the tabs on the power-supply unit into the latches on the chassis. 2. Align the screw holes on the power-supply unit to the screw holes on the chassis. 3. Replace the three screws (6-32#) that secure the power-supply unit to the chassis. 4.
  • Page 92 Processor fan and heat-sink assembly Removing the processor fan and heat-sink assembly CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable.
  • Page 93 Installing the processor fan and heat-sink assembly CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task NOTE: When installing this component, use the thermal grease that is provided in the kit to ensure optimal thermal conductivity.
  • Page 94 Processor Removing the processor CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable.
  • Page 95 Installing the processor CAUTION: The information in this installation section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image indicates the location of the processor and provides a visual representation of the installation procedure. Figure 69.
  • Page 96 System board Removing the system board CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the cable cover, if applicable. 3. Remove the dust filter, if applicable.
  • Page 97 Figure 70. System board callouts 1. Intrusion-switch cable (INTRUSION) 2. Serial-port module (KB MS SERIAL) 3. Processor-power cable (ATX CPU1) 4. Processor socket (CPU) 5. Processor-fan and heat-sink assembly cable (FAN CPU) 6. Memory slot (DIMM2) 7. Memory slot (DIMM1) 8.
  • Page 98 Figure 71. Removing the system board Figure 72. Removing the system board Removing and installing Field Replaceable Units (FRUs)
  • Page 99 Figure 73. Removing the system board Removing and installing Field Replaceable Units (FRUs)
  • Page 100 Figure 74. Removing the system board Steps 1. Remove the screw (6-32#) that secures the front I/O-bracket to the chassis. 2. Remove and lift the front I/O-bracket from the chassis. 3. Disconnect the intrusion-switch cable from its connector (INTRUSION) on the system board. 4.
  • Page 101 About this task Figure 75. System board callouts 1. Intrusion-switch cable (INTRUSION) 2. Serial-port module (KB MS SERIAL) 3. Processor-power cable (ATX CPU1) 4. Processor socket (CPU) 5. Processor-fan and heat-sink assembly cable (FAN CPU) 6. Memory slot (DIMM2) 7. Memory slot (DIMM1) 8.
  • Page 102 Figure 76. Installing the system board Removing and installing Field Replaceable Units (FRUs)
  • Page 103 Figure 77. Installing the system board Removing and installing Field Replaceable Units (FRUs)
  • Page 104 Figure 78. Installing the system board Figure 79. Installing the system board Steps 1. Slide the front I/O-ports on the system board into the front I/O-slots on the chassis. 2. Align the screw holes on the system board with the screw holes on the chassis. 3.
  • Page 105 9. Connect the system-board power cable to its connector (ATX SYS) on the system board. 10. Route the processor-power cable through the routing guides on the chassis. 11. Connect the processor-power cable to its connectors (ATX CPU1) on the system board. 12.
  • Page 106 ● Windows 11 Pro ● Windows 11 Pro National Education ● Ubuntu Linux 24.04 LTS Drivers and downloads When troubleshooting, downloading, or installing drivers, it is recommended that you read the Dell Knowledge Base article Drivers and Downloads FAQs 000123347. Software...
  • Page 107 BIOS Setup NOTE: Depending on the computer and the installed devices, the options that are listed in this section may or may not be displayed. CAUTION: Certain changes can make your computer work incorrectly. Before you change the settings in BIOS Setup, it is recommended that you note down the original settings for future reference.
  • Page 108 Depending on your computer and its installed devices, the items that are listed in this section may or may not be displayed. Table 26. BIOS Setup options—Overview menu  Overview Dell Pro Tower QCT1250 BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer.
  • Page 109 Table 26. BIOS Setup options—Overview menu (continued) Overview Processor ID Displays the processor identification code. Processor L2 Cache Displays the processor L2 cache size. Processor L3 Cache Displays the processor L3 cache size. Microcode Version Displays the microcode version. Intel Hyper-Threading Capable Displays whether the processor is Hyper-Threading (HT) capable.
  • Page 110 The computer stops booting to the operating system when a component is not authenticated during the boot process. Secure Boot can be enabled in BIOS setup or using management interfaces like Dell Command|Configure, but can only be disabled from BIOS setup.
  • Page 111 Table 28. BIOS Setup options—Integrated Devices menu (continued) Integrated Devices Audio Enable Audio Enables all integrated audio controller. By default, all the options are enabled. Enable Microphone Enables the microphone. By default, the Enable Microphone option is enabled. NOTE: Depending on the configuration ordered, the microphone setup option may not be available.
  • Page 112 Table 30. BIOS Setup options—Display menu  Display Primary Display This field determines which video controller will become the primary display when multiple controllers are available in the system. If you select a device other than what you are currently using, you will have to reconnect your video cable to your selected device.
  • Page 113 TPM 2.0 Security On Allows you to enable or disable TPM. By default, the TPM On option is enabled. For additional security, Dell Technologies recommends keeping TPM On enabled to allow these security technologies to fully function. Physical Presence Interface (PPI) Bypass...
  • Page 114 BIOS. This option returns to the disabled state when the computer restarts. By default, the Clear option is disabled. Dell Technologies recommends enabling the Clear option only when TPM data is required to be cleared. Physical Presence Interface (PPI) Bypass By default, the PPI Bypass for Clear Commands option is disabled.
  • Page 115 By default, the Start Data Wipe option is disabled. Absolute Absolute Software provides various cyber security solutions, some requiring software preloaded on Dell computers and integrated into the BIOS. To use these features, you must enable the Absolute BIOS setting and contact Absolute for configuration and activation.
  • Page 116 Password prompt. ● The computer password is not prompted when the computer resumes from standby mode. Dell Technologies recommends using the computer password in situations where it is likely that a computer may be lost or stolen. Storage device Password The storage device password can be set to prevent unauthorized access of the data stored on the device.
  • Page 117 BIOS passwords. You can modify the minimum and maximum length of the passwords and require passwords to contain certain character classes (upper case, lower case, digit, special character). Dell Technologies recommends setting the minimum password length to at least eight characters. Password Bypass The Password Bypass option allows the computer to reboot from the operating system without entering the computer or hard drive password.
  • Page 118 The Recovery Password can be used when a system owner forgets the administrator, system, or hard drive password. You can get an unlock code from Dell Support over the phone after verifying ownership details. The unlock code overrides and removes the existing password.
  • Page 119 Allows you to control the automatic boot flow for SupportAssist System Resolution Console and for Dell OS Recovery Tool. By default, the Dell Auto OS Recovery Threshold value is set to 2. Table 36. BIOS Setup options—System Management menu  System Management Service Tag Displays the Service Tag of the computer.
  • Page 120 This option is not available when the virtualization setting for IOMMU is disabled (VT-d/AMD Vi). By default, the Enable Pre-Boot DMA Support option is enabled. For additional security, Dell Technologies recommends keeping the Enable Pre- Boot DMA Support option enabled. NOTE: This option is provided only for compatibility purposes, since some older hardware is not DMA capable.
  • Page 121 Failure to provide the recovery key can result in data loss or an operating system reinstall. For more information, see the Knowledge Base Resource updating the BIOS on Dell systems with BitLocker enabled. Steps 1.
  • Page 122 Failure to provide the recovery key can result in data loss or an operating system reinstall. For more information, see the Knowledge Base Resource updating the BIOS on Dell systems with BitLocker enabled. Steps 1.
  • Page 123 ● USB drive formatted to the FAT32 file system (the drive does not have to be bootable) ● BIOS executable file that you downloaded from the Dell Support website and copied to the root of the USB drive ● AC power adapter must be connected to the computer ●...
  • Page 124 Assigning a System Setup password Prerequisites You can assign a new System or Admin Password only when the status is set to Not Set. To enter BIOS System Setup, press F2 immediately after a power-on or reboot. Steps 1. In the System BIOS or System Setup screen, select Security and press Enter. The Security screen is displayed.
  • Page 125 Clearing system and setup passwords About this task To clear the system or setup passwords, contact Dell technical support as described at Contact Support. NOTE: For information about how to reset Windows or application passwords, see the documentation accompanying Windows or your application.
  • Page 126 Check diagnostics About this task SupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The Dell SupportAssist Pre-boot System Performance Check diagnostics is embedded within the BIOS and launched by the BIOS internally. The embedded system diagnostics provides options for particular devices or device groups allowing you to: ●...
  • Page 127 It enables you to diagnose hardware issues, repair your computer, back up your files, and restore your computer to its factory state. You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into the primary operating system due to software or hardware failures.
  • Page 128 Real-Time Clock—RTC reset The Real-Time Clock (RTC) reset function allows you or the service technician to recover the recently launched model Dell Pro and Pro Max computers from No POST/No Boot/No Power situations. You can initiate the RTC reset on the computer from a power-off state only if it is connected to AC power.
  • Page 129 Getting help and contacting Dell Self-help resources You can get information and help on Dell products and services using these self-help resources: Table 44. Self-help resources  Self-help resources Resource location Information about Dell products and services Dell Site Tips Contact Support In Windows search, type Contact Support, and press Enter.

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