Solving problems, Diagnostic lights – Dell OptiPlex GX270 User Manual
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Solving Problems
Dell™ OptiPlex™ GX270 Systems User's Guide
Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D" on the back panel. The lights can be yellow 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.
E-Mail, Modem, and Internet Problems
Serial or Parallel Device Problems
CAUTION:
Before you begin any of the procedures in this section, follow the steps in "
Safety Instructions
."
Light
Pattern
Problem Description
Suggested Resolution
off
off
off
off
The computer is in a normal off
condition or a possible pre-
BIOS failure has occurred.
Verify that the computer is plugged into a working electrical outlet and that you have pressed the power
button.
green
yellow
yellow
yellow
A possible BIOS failure has
occurred; the computer is in
the recovery mode.
Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
yellow
green
yellow
yellow
A possible microprocessor
failure has occurred.
Reinstall the microprocessor and restart the computer.
green
green
yellow
yellow
Memory modules are
detected, but a memory failure
has occurred.
l
If you have one memory module installed, reinstall it and restart the computer.
l
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.
l
If available, install properly working memory of the same type into your computer.
l
If the problem persists,
contact Dell
.
yellow
yellow
green
yellow
A possible expansion card
failure has occurred.
1.
Determine if a conflict exists by removing a card (not the video card) and then restarting the
computer.
2.
If the problem persists, reinstall the card that you removed, remove a different card, and then
restart the computer.
3.
Repeat this process for each card. If the computer starts normally, troubleshoot the last card
removed from the computer for resource conflicts (see "
Resolving Software and Hardware
Incompatibilities
").
4.
Move each card one at a time to a different PCI slot and restart the computer after each move.
5.
If the problem persists,
contact Dell
.
green
yellow
green
yellow
A possible video card failure
has occurred.
l
If the computer has a video card, remove the card, reinstall it, and then restart the computer.
l
If the problem still exists, install a video card that you know works and restart the computer.
l
If the problem persists or the computer has integrated video,
contact Dell
.