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APPENDIX B: SERVER HARDWARE TROUBLESHOOTING
Diagnostic LEDs
Power Button LED
Problem Description
Troubleshooting Steps
A possible system board
failure has occurred.
Unplug the computer. Allow one minute for the power to drain.
Plug the computer into a working electrical outlet and press the
power button.
A possible system
board, power supply, or
peripheral failure has
occurred.
Power off computer, leaving the computer plugged in. Press and
hold the power supply test button at the rear of the power supply
unit. If the LED next to the switch illuminates, the problem may be
with your system board.
If the LED next to the switch does not illuminate, disconnect all
internal and external peripherals, and press and hold the power
supply test button. If it illuminates, there could be a problem with
a peripheral.
If the LED still does not illuminate, remove the PSU connections
from the system board, then press and hold the power supply
button. If it illuminates, there could be a problem with the system
board.
If the LED still does not illuminate, the problem is with the power
supply.
Memory modules are
detected, but a memory
power failure has oc-
curred.
If two or more memory modules are installed, remove the modules,
then re-install one module and re-start the computer. If the
computer starts normally, continue to install additional memory
modules (one at a time) until you have identified a faulty module or
reinstalled all modules without error. If only one memory module is
installed, try moving it to a different DIMM connector and re-start
the computer.
If available, install verified working memory of the same type into
your computer.
Optiplex 990 only:
A possible CPU or
system board failure has
occurred.
Replace the CPU with a known good CPU. If the computer still fails
to boot, inspect the CPU socket for damage.
Optiplex 990 only:
Optiplex 790 only:
BIOS may be corrupt or
missing.
The computer hardware is operating normally but the BIOS may be
corrupt or missing.
BIOS may be corrupt or
missing.
The computer hardware is operating normally but the BIOS may be
corrupt or missing.
A possible system board
failure has occurred.
Remove all peripheral cards from the PCI and PCI-E slots and re-
start the computer. If the computer boots, add the peripheral cards
back one by one until you find the bad one.
Power connector not
installed properly.
Re-seat the 2x2 power connector from the power supply unit.
Possible peripheral card
or system board failure
has occurred.
Remove all peripheral cards from the PCI and PCI-E slots and re-
start the computer. If the computer boots, add the peripheral cards
back one by one until you find the bad one.
