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Dell Pro Slim QCS1250 Owner's Manual
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Dell Pro Slim QCS1250 Owner's Manual

Dell Pro Slim QCS1250 Owner's Manual

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Dell Pro Slim
QCS1250
Owner's Manual
Regulatory Model: D18S
Regulatory Type: D18S002/D18S003
March 2025
Rev. A00

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Summary of Contents for Dell Pro Slim QCS1250

  • Page 1 Dell Pro Slim QCS1250 Owner's Manual Regulatory Model: D18S Regulatory Type: D18S002/D18S003 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 Slim QCS1250..................7 Front....................................... 7 Back......................................8 Top......................................10 Chapter 2: Set up your computer....................11 Chapter 3: Specifications of Dell Pro Slim QCS1250..............15 Dimensions and weight..............................15 Processor..................................... 15 Operating system................................17 Chipset....................................17 Memory....................................18 External ports and slots..............................19...
  • Page 4 Chapter 5: Cable cover........................ 33 Removing the cable cover...............................33 Installing the cable cover..............................33 Chapter 6: Side cover........................35 Removing the side cover..............................35 Installing the side cover..............................36 Chapter 7: Coin-cell battery cover....................39 Removing the coin-cell battery cover.......................... 39 Installing the coin-cell battery cover..........................39 Chapter 8: Coin-cell battery......................
  • Page 5 Removing the hard drive............................67 Installing the hard drive..............................68 Intrusion switch..................................70 Removing the intrusion switch..........................70 Installing the Intrusion switch...........................70 Power button..................................71 Removing the power button............................71 Installing the power button............................72 Chapter 10: Removing and installing Field Replaceable Units (FRUs)........... 74 Antenna modules................................
  • Page 6 Deleting or changing an existing system password or setup password............119 Clearing CMOS settings..............................119 Clearing system and setup passwords........................119 Chapter 13: Troubleshooting...................... 120 Dell SupportAssist Pre-boot System Performance Check diagnostics.............. 120 Running the SupportAssist Pre-Boot System Performance Check.............. 120 Power-Supply Unit Built-in Self-Test ........................120 System-diagnostic lights..............................120 Recovering the operating system..........................121...
  • Page 7 Views of Dell Pro Slim QCS1250 Front Figure 1. Front view of Dell Pro Slim QCS1250 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 Reads from and writes to CDs and DVDs. Back Figure 2. Back view of Dell Pro Slim QCS1250 1. DisplayPort 1.4a (HBR3) port/DisplayPort 1.4a (HBR2) port Connect an external display or a projector. Each port supports a resolution of up to 5120 x 3200 at 60 Hz (HBR3) or 4096 x 2304 at 60 Hz (HBR2).
  • Page 9 5120 x 3200 at 60 Hz with a Type-C to DisplayPort adapter. ● Two USB 3.2 Gen 2 (10 Gbps) ports Connect devices such as external storage devices and printers. Provides a data transfer speed of up to 10 Gbps. 13. Legacy serial port (optional) Views of Dell Pro Slim QCS1250...
  • Page 10 Figure 3. Top view of Dell Pro Slim QCS1250 1. MyDell QR code MyDell is your hub for content that is personalized to your Dell Pro Slim QCS1250, including videos, articles, manuals, and easy access to support. Views of Dell Pro Slim QCS1250...
  • Page 11 Set up your computer Steps 1. Connect the keyboard and mouse. 2. Connect to your network using a cable, or connect to a wireless network. Set up your computer...
  • Page 12 3. Connect the display. 4. Connect the power cable. Set up your computer...
  • Page 13 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. For Windows: Follow the on-screen instructions to complete the setup. When setting up, Dell Technologies recommends that you: Set up your computer...
  • Page 14 Table 1. Locate Dell apps  Resources Description Dell Optimizer is an application designed to enhance computer performance and productivity by optimizing settings for power, battery, display, collaboration touchpad, and presence detection. It also provides access to applications purchased with your new computer.
  • Page 15 The weight of your computer depends on the ● Maximum: 5.89 kg kg (12.99 lb) configuration that is ordered. Processor The following tables list the details of the processors that are supported in your Dell Pro Slim QCS1250. Specifications of Dell Pro Slim QCS1250...
  • Page 16 Option 7 Option 8 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 Specifications of Dell Pro Slim QCS1250...
  • Page 17 ● Windows 11 Pro ● Windows 11 Pro National Education ● Ubuntu Linux 24.04 LTS Chipset The following table lists the details of the chipset that is supported by your Dell Pro Slim QCS1250. Table 5. Chipset  Description Option one...
  • Page 18 Option one Option two PCIe bus Up to Gen3 Up to Gen4 Memory The following table lists the memory specifications that are supported by your Dell Pro Slim QCS1250. Table 6. Memory specifications  Description Values Memory slots Two UDIMM slots...
  • Page 19 The following table lists the external ports that are supported on the optional module slot for Dell Pro Slim QCS1250. NOTE: The ports that are listed in this table are mutually exclusive. Your Dell Pro Slim QCS1250 can only support one of the listed options.
  • Page 20 PCIe ● One half-height Gen3 PCIe x16 slot ● Two half-height Gen3 PCIe x1 slots Ethernet The following table lists the wired Ethernet Local Area Network (LAN) specifications of your Dell Pro Slim QCS1250. Table 10. Ethernet specifications  Description Values...
  • Page 21 Your Dell Pro Slim Plus QCS1250 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 Slim Plus QCS1250 is the M.2 solid state drive.. Table 13. Storage specifications  Storage type...
  • Page 22 ● One 8-pin connector for the system board ● One 8-pin header for the graphic card GPU—Integrated The following table lists the specifications of the integrated Graphics Processing Unit (GPU) supported by your Dell Pro Slim QCS1250. Table 16. GPU—Integrated ...
  • Page 23 GPU—Integrated The following table lists the specifications of the integrated Graphics Processing Unit (GPU) supported by your Dell Pro Slim QCS1250. Table 17. GPU—Integrated  Controller Memory size Processor Intel UHD Graphics 710/ Shared system memory Intel Core 300 Intel UHD Graphics 730...
  • Page 24 Hardware security The following table lists the hardware security of your Dell Pro Slim QCS1250. Table 20. Hardware security   Hardware security Chassis intrusion switch Chassis lock slot support Intel Authenticate Intel Secure Boot Security-cable slot (Kensington lock) Local hard drive data wipe through BIOS (Secure Erase)
  • Page 25 Dell Regulatory Compliance Home Page Responsible Business Alliance Policy Operating and storage environment This table lists the operating and storage specifications of your Dell Pro Slim QCS1250. Airborne contaminant level: G1 as defined by ISA-S71.04-1985 Table 23. Computer environment  Description...
  • Page 26 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 27 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 28 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 29 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 30 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 31 Major components of Dell Pro Slim QCS1250 The following image shows the major components of Dell Pro Slim QCS1250. 1. Side cover 2. Graphics card 3. Processor 4. Memory module 5. M.2 2280 solid state drive 6. System board 7. Chassis 8.
  • Page 32 20. Intrusion switch NOTE: Dell 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.
  • Page 33 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 4. Removing the cable cover Steps 1.
  • Page 34 Figure 5. 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 35 Side cover Removing the 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 side cover and provide a visual representation of the removal procedure. Figure 6.
  • Page 36 Figure 7. Removing the side cover Steps 1. Place the computer on its side with the side cover facing up. 2. Loosen the two captive screws (6-32#) that secure the side cover to the chassis. 3. Slide the side cover towards the back of the computer. 4.
  • Page 37 Figure 8. Installing the side cover Figure 9. Installing the side cover Side cover...
  • Page 38 Steps 1. Align the tabs on the side cover with the slots on the chassis. 2. Slide the side cover towards the front of the computer. 3. Tighten the two captive screws (6-32#) that secure the side cover to the chassis. 4.
  • Page 39 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 side cover. 5. Remove the front cover.
  • Page 40 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 11. 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 41 Coin-cell battery Removing the coin-cell battery WARNING: This computer contains a coin-cell battery and requires trained technicians for handling guidance. CAUTION: Removing the coin-cell battery will clear the CMOS and will reset BIOS settings. Prerequisites 1. Follow the procedure in Before working inside your computer.
  • Page 42 Installing the coin-cell battery WARNING: This computer contains a coin-cell battery and requires trained technicians for handling guidance. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the coin-cell battery and provide a visual representation of the installation procedure.
  • Page 43 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 44 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 15.
  • Page 45 Figure 16. Removing the front cover Steps 1. Gently pry and release the front-cover tabs one by one. 2. Pivot the front cover outward from the chassis and remove the front cover. Installing the front cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the front cover and provide a visual representation of the installation procedure.
  • Page 46 Figure 17. Installing the front cover Steps 1. Insert the shorter front-cover tabs into the corresponding slots on the chassis. 2. Pivot the front cover on the shorter front-cover tabs toward the chassis, snapping the longer front-cover tabs into place. Next steps 1.
  • Page 47 Figure 18. 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 48 Figure 19. 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 49 About this task The following images indicate the location of the memory modules and provide a visual representation of the removal procedure. Figure 20. Removing a memory module Steps 1. Use your fingertips to carefully spread apart the securing clips on each end of the memory-module slot (DIMM1 or DIMM2, whichever is applicable) .
  • Page 50 Figure 21. Installing the memory module Steps 1. Ensure that the memory-module securing clips are in an open position. 2. Align the notch on the memory module with the tab on the memory-module slot (DIMM1 or DIMM2, whichever is applicable). 3.
  • Page 51 5. Remove the front cover. 6. Remove the drive bay. About this task NOTE: This procedure only applies if there is an M.2 2230 solid state drive that is installed in M.2 solid state drive slot 0 (M.2 PCIe SSD - 0) NOTE: Ensure that the mounting screw is in the correct location to install the M.2 2230 solid state drive, see Location of...
  • Page 52 Figure 23. 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 53 Figure 24. 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 54 Figure 25. 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 55 Figure 26. Moving the mounting screw to the screw mount for M.2 2280 solid state drive Steps 1. Remove the mounting screw from the system board. 2. Install the mounting screw on the screw mount for the appropriate form factor on the system board. Next steps 1.
  • Page 56 Figure 27. Removing the graphics card Steps 1. Open the PCIe latch that secures the graphics card to the PCI card connector (SLOT 3). 2. Pull the tab that secures the graphics card to the PCIe card connector (SLOT 3). 3.
  • Page 57 Figure 28. Installing the graphics card Steps NOTE: Ensure that the PCIe door is in the open position and the release tab on the PCIe card connector (SLOT 2) is up. Align the graphics card with the PCIe card connector (SLOT 3) on the system board. 2.
  • Page 58 Figure 29. Removing the wireless card Steps 1. Remove the screw (M2x3.5) that secures the wireless-card bracket to the system board. 2. Slide and lift the wireless-card bracket off the wireless card. 3. Disconnect the antenna cables from the wireless card. 4.
  • Page 59 Figure 30. Installing the wireless card Steps 1. Connect the antenna cables to the wireless card. Table 25. Antenna-cable color scheme  Connector on the Antenna-cable color Silkscreen marking wireless card △ (white triangle) Main White MAIN Auxiliary Black ▲ (black triangle) 2.
  • Page 60 Optical drive Removing the optical drive 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 side cover. 5. Remove the front cover.
  • Page 61 Figure 32. Removing the optical drive Steps 1. Disconnect the data cable and the power cable from the optical drive. 2. Press down on the securing tab to release the optical drive from the drive bay. 3. Pull to slide the optical drive out of the drive bay. 4.
  • Page 62 Figure 33. Installing the optical drive Removing and installing Customer Replaceable Units (CRUs)
  • Page 63 Figure 34. Installing the optical drive Steps 1. Align the tabs on the bezel with the slots on the optical drive. 2. Press the bezel against the optical drive until the bezel clicks into place. 3. Insert the alignment post on the securing tab into the hole on the optical drive. 4.
  • Page 64 4. Remove the 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 35. Removing the drive bay Removing and installing Customer Replaceable Units (CRUs)
  • Page 65 Figure 36. Removing the drive bay Steps 1. Disconnect the data cable and the power cable from the optical drive. 2. Remove the data cable and the power cable from the routing guide on the drive bay. 3. Disconnect the data cable and the power cable from the hard drive. 4.
  • Page 66 Figure 37. Installing the drive bay Figure 38. Installing the drive bay Steps 1. While holding the drive bay firmly with both hands, slide and secure one side of the drive bay to the chassis. Removing and installing Customer Replaceable Units (CRUs)
  • Page 67 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 data cable and the power cable to the hard drive. 4. Connect the data cable and the power cable to the optical drive. 5.
  • Page 68 Figure 39. Removing the hard drive Steps 1. Flip the drive bay over to reveal the hard drive. 2. While pulling the securing tab away from the side of the hard drive, slide and lift the hard disk at an angle off the drive bay. 3.
  • Page 69 Figure 40. 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 until it clicks into place. 3.
  • Page 70 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 side cover. 5. Remove the front cover.
  • Page 71 Figure 42. Installing the Intrusion switch Steps 1. Slide the intrusion switch into the slot on the chassis. 2. Connect the intrusion-switch cable to its connector (INTRUSION) on the system board. Next steps 1. Install the drive bay. 2. Install the front cover.
  • Page 72 Figure 43. Removing the power button Steps 1. Remove the processor power cables from the routing guide on the chassis. 2. Move the processor cables off the power-button cable. 3. Disconnect the power-button cable from its connector (PWR SW) on the system board. 4.
  • Page 73 Figure 44. Installing the power button Steps 1. Thread the power-button module cable through the slot on the front of the chassis. 2. Align the tabs on the side of the power button with the cutouts on the slot in the chassis. 3.
  • Page 74 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 75 Figure 45. Removing the antenna modules Steps 1. Gently remove the antenna cable from the routing guide on the chassis interior. 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 76 Figure 46. 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 77 Power-supply unit Removing the power-supply unit CAUTION: The information in this 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 78 Figure 47. Removing the power-supply unit Removing and installing Field Replaceable Units (FRUs)
  • Page 79 Figure 48. Removing the power-supply unit Steps 1. Disconnect the power-supply cables from their connectors (ATX CPU1 and ATX SYS) on the system board. 2. Remove the power-supply cables from the routing guides on the chassis. 3. Remove the three screws (6-32#) that secure the power-supply unit to the chassis. 4.
  • Page 80 Figure 49. Installing the power-supply unit Removing and installing Field Replaceable Units (FRUs)
  • Page 81 Figure 50. Installing the power-supply unit Steps 1. Place the power-supply unit on the chassis and slide it towards the back of the chassis. 2. Replace the three screws (6-32#) that secure the power-supply unit to the chassis. 3. Route the power-supply cables through their routing guides on the chassis. 4.
  • Page 82 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 side cover. 5. Remove the front cover. 6. Remove the drive bay. About this task The following images indicate the location of the processor fan and heat-sink assembly and provide a visual representation of the removal procedure.
  • Page 83 About this task The following image indicates the location of the processor fan and heat-sink assembly and provides a visual representation of the installation procedure. NOTE: If either the processor fan and heat-sink assembly is replaced, use the thermal grease provided in the kit for thermal conductivity.
  • Page 84 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 side cover. 5. Remove the front cover. 6. Remove the drive bay. 7.
  • Page 85 About this task NOTE: The optional-port modules are mutually exclusive; only a single module can be installed at a time. The following images indicate the location of the optional-port module and provide a visual representation of the installation procedure. Figure 54. Installing the optional-port module Removing and installing Field Replaceable Units (FRUs)
  • Page 86 Figure 55. Installing the optional-port module Steps 1. Using a screwdriver, push against the optional-port cover until it comes off. NOTE: This step is only applicable if you are installing the optional-port module on a computer that did not previously have it installed.
  • Page 87 Serial-port module Removing the serial-port module CAUTION: The information in this 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 88 Figure 56. Removing the serial-port module Steps 1. Remove the two screws (M3) that secure the optional serial-port module to the chassis. 2. Disconnect the serial-port module cable from the connector (KB MS SERIAL) on the system board. 3. Push the serial port through its slot on the chassis and lift the serial-port module off the system board. Installing the serial-port module CAUTION: The information in this section is intended for authorized service technicians only.
  • Page 89 Figure 57. Installing the serial-port module Removing and installing Field Replaceable Units (FRUs)
  • Page 90 Figure 58. Installing the serial-port module Steps 1. Using a screwdriver, push against the serial-port cover until it comes off. NOTE: This step is only applicable if the serial-port module is not previously installed on the computer. 2. Insert the serial-port module into its slot on the chassis. 3.
  • Page 91 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 side cover. 5. Remove the front cover. 6. Remove the drive bay. 7.
  • Page 92 Figure 60. Installing the processor Steps 1. Ensure that the release lever on the processor socket is fully extended in the open position. NOTE: The pin-1 corner of the processor has a triangle that aligns with the triangle on the pin-1 corner on the processor socket.
  • Page 93 4. Remove the side cover. 5. Remove the coin-cell battery cover. 6. Remove the coin-cell battery. 7. Remove the front cover. 8. Remove the memory. 9. Remove the M.2 2230 solid state drive, or the M.2 2280 solid state drive, whichever is applicable. 10.
  • Page 94 10. Hard-drive data connector (SATA - 0) 11. Optical-drive data connector (SATA - 3) 12. Coin-cell battery socket (RTC) 13. Solid state drive slot (M.2 PCIe SSD - 0) 14. Wireless-card slot (M.2 WLAN) 15. PCIe x16 slot (SLOT 3) 16.
  • Page 95 Figure 63. Removing the system board 3. Disconnect the power-supply cable from its connector (ATX CPU1) on the system board. 4. Remove the power-supply cable from the routing guides and keep it away. 5. Disconnect the power-button cable from its connector (PWR SW) on the system board. 6.
  • Page 96 Figure 64. Removing the system board 12. Remove the six screws (6-32#)) that secure the system board to the chassis. 13. Remove the screw mount that secures the system board to the chassis. Removing and installing Field Replaceable Units (FRUs)
  • Page 97 Figure 65. Removing the system board 14. Free the system board from the back I/O panel by sliding it towards the right and lift the system board out of the chassis. Installing the system board CAUTION: The information in this removal section is intended for authorized service technicians only. Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure.
  • Page 98 Figure 66. System board overview 1. Intrusion-switch connector (INTRUSION) 2. Processor-power connector (ATX CPU1) 3. Processor socket (CPU) 4. Processor-fan and heat-sink assembly connector (FAN CPU) 5. UDIMM memory slot (DIMM2) 6. UDIMM memory slot (DIMM1) 7. Power-button connector (PWR SW) 8.
  • Page 99 Figure 67. Installing the system board Removing and installing Field Replaceable Units (FRUs)
  • Page 100 Figure 68. Installing the system board Removing and installing Field Replaceable Units (FRUs)
  • Page 101 Figure 69. Installing the system board Figure 70. Installing the system board Steps 1. Align and lower the system board into the system until the stand-off points at the back of the system board align with those on the chassis. 2.
  • Page 102 9. Route and connect the hard-drive data cable to its connector (SATA - 0) on the system board. 10. Route and connect the speaker cable to its connector (INT SPKR) on the system board. 11. Route and connect the system-fan cable to its connector (FAN SYS) on the system board. 12.
  • Page 103 ● 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 104 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 105 Depending on your computer and its installed devices, the items that are listed in this section may or may not be displayed. Table 27. BIOS Setup options—Overview menu  Overview Dell Pro Slim QCS1250 BIOS Version Displays the BIOS version number. Service Tag Displays the Service Tag of the computer.
  • Page 106 Table 27. 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 107 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 108 Table 29. BIOS Setup options—Integrated Devices menu (continued) Integrated Devices By default, the Enable Front External USB Ports option is enabled. Enable Rear USB Ports Enables the rear external USB ports. By default, the Enable Rear External USB Ports option is enabled. Enable USB Boot Support Enables booting from USB mass storage devices that are connected to external USB ports.
  • Page 109 Table 31. BIOS Setup options—Display menu  Display Primary Display Determines which video controller will become the primary display when there are multiple controllers available. When a specific device is selected display output is only available from ports located on that selected device. Table 32.
  • Page 110 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. PPI Bypass for Clear Commands By default, the PPI Bypass for Clear Commands option is disabled.
  • Page 111 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 112 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 113 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 114 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 37. BIOS Setup options—System Management menu  System Management Service Tag Displays the Service Tag of the computer.
  • Page 115 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 116 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 117 ● 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 118 2. Turn on the computer and press F12 to access the One Time Boot Menu. Select BIOS Update using the mouse or arrow keys then press Enter. The flash BIOS menu is displayed. 3. Click Flash from file. 4. Select the external USB device. 5.
  • Page 119 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 120 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 121 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 122 Backup media and recovery options It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell provides multiple options for recovering the Windows operating system on your Dell computer. For more information, see...
  • Page 123 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 45. 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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