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Solving Problems
Dell™OptiPlex™170LUser'sGuide
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.
Clearing NVRAM and Restoring Default Settings
Serial or Parallel Device Problems
Dropped or Damaged Computer
Sound and Speaker Problems
Video and Monitor Problems
CAUTION: Before you perform any of the procedures below, follow the safety instructions in the Product Information Guide.
The computer is in a normal
off condition or a possible
pre-BIOS failure has
occurred.
l Verify that the computer is plugged into a working electrical outlet and that you have pressed the
power button.
A possible processor failure
has occurred.
l Reinstall the processor and restart the computer.
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 memory modules installed, remove the modules, reinstall one module, and then
restart the computer. If the computer starts normally, reinstall the second module.
l If available, install properly working memory of the same type into your computer.
l If the problem persists, contact Dell.
A possible PCI expansion
card failure has occurred.
l Determine if a conflict exists by removing a card (not the video card) and then restarting the
computer.
l If the problem persists, reinstall the card that you removed, remove a different card, and then
restart the computer.
l 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").
l Move each card one at a time to a different PCI slot and restart the computer after each move.
l If the problem persists, contact Dell.
A possible IDE drive failure
has occurred.
l Reseat all IDE drive power and data cables and restart the computer.
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