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80 Chapter 4
Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect,
whether a short circuit is suspected, or whether the system is inoperative. Use these procedures to isolate the
failing FRU (do not isolate non-defective FRU).
IMPORTANT:Verify that all attached devices are supported by the system.
IMPORTANT:Verify that the power supply being used at the time of the failure is operating correctly. (See
“Power System Check” on page 67.)
To isolate the failing FRU:
1. Turn off the system.
2. Visually check FRU parts for damage. If you identify any damage, replace the FRU.
3. Remove or disconnect all of the following devices:
• Non-Acer devices
• Printer, mouse, and other external devices
•Battery pack
• Hard disk drive
• SO-DIMM
• External optical drive
4. Turn on the system.
5. Determine if the problem has changed.
• If the problem does not recur, reconnect the removed devices one at a time until you find the failing
FRU.
• If the problem does recur, replace the following FRUs one at a time.
• Mainboard
• LCD assembly
IMPORTANT:Do not replace a non-defective FRU.