Diagnostic Lights - Dell OptiPlex 745 User Manual

Blinking yellow
Solid green and a beep code
during POST
Solid green power light and no
beep code and no video during
POST
Solid green power light and no
beep code but the computer
locks up during POST
Diagnostic Lights
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front or back panel. The lights can be off or green.
When the computer starts normally, the patterns or codes on the lights change as the boot process completes.
If the POST portion of system boot completes successfully, all four lights display solid green. If the computer malfunctions during the POST process, the pattern
displayed on the LEDs may help identify where in the process the computer halted.
NOTE: The orientation of the diagnostic lights may vary dependent upon the computer type. The diagnostic lights can appear either vertical or
horizontal.
Light Pattern Problem Description
The computer is in a normal "off"
condition, or a possible pre-BIOS failure
has occurred.
The diagnostic lights are not lit after the
computer successfully boots to the
operating system.
A possible BIOS failure has occurred; the
computer is in the recovery mode.
A possible processor failure has occurred.
Memory modules are detected, but a
memory failure has occurred.
A possible graphics card failure has
occurred.
A possible floppy or hard drive failure has
occurred.
A possible USB failure has occurred.
No memory modules are detected.
on the system board may be faulty or incorrectly
installed.
A power supply or system board failure has
occurred.
A problem was detected while the BIOS was
executing.
The monitor or the graphics card may be faulty or
incorrectly installed.
An integrated system board device may be faulty.
Suggested Resolution
Plug the computer into a working electrical outlet and press the power button.
Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
Reinstall the processor and restart the computer.
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Reseat all power and data cables and restart the computer.
Reinstall all USB devices, check cable connections, and then restart the computer.
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If the computer does not boot, contact Dell for technical assistance
(see Contacting
See Power Problems.
See Beep Codes
check the diagnostic lights to see if the specific problem is identified
(see Diagnostic
Check the diagnostic lights to see if the specific problem is identified
(see Diagnostic
See Video and Monitor
Check the diagnostic lights to see if the specific problem is identified
(see Diagnostic
for technical assistance (see
If you have one memory module installed, reinstall it and restart the computer. (see
Memory for instructions on how to remove and install memory modules.)
If you have two or more memory modules installed, remove the modules, reinstall one
module, and then restart the computer. If the computer starts normally, reinstall an
additional module. Continue until you have identified a faulty module or reinstalled all
modules without error.
If available, install properly working memory of the same type into your computer.
If the problem persists, contact Dell (see
If the computer has a graphics card, remove the card, reinstall it, and then restart the
computer.
If the problem still exists, install a graphics card that you know works and restart the
computer.
If the problem persists or the computer has integrated graphics, contact Dell (see
Contacting Dell).
If you have one memory module installed, reinstall it and restart the computer. (see
Memory for instructions on how to remove and install memory modules.)
If you have two or more memory modules installed, remove the modules, reinstall one
module, and then restart the computer. If the computer starts normally, reinstall an
additional module. Continue until you have identified a faulty module or reinstalled all
modules without error.
If available, install properly working memory of the same type into your computer.
If the problem persists, contact Dell (see
Dell).
for instructions on diagnosing the beep code. Also,
Lights).
Lights).
Problems.
Lights). If the problem is not identified, contact Dell
Contacting Dell).
Contacting Dell).
Contacting Dell).