Troubleshooting 4-19
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do
with a hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU
replacement should be considered only when a recurring problem exists.
When analyzing an intermittent problem, perform the following:
1. Run the advanced diagnostic test (refer to System Utilities on page 2-2) for the system board
in loop mode at least 10 times.
2. If no error is detected, do not replace any FRU.
3. If an error is detected, replace the FRU. Rerun the test to verify that there are no more errors.
Undetermined Problems
The diagnostic problems do not identify which adapter or device failed, which installed devices are
incorrect, whether a short circuit is suspected, or whether the system is inoperative.
NOTE:
• Verify that all attached devices are supported by the computer.
• Verify that the power supply being used at the time of the failure is operating correctly. (refer
to Power On Issues on page 4-3).
Perform the following procedures to isolate the failing FRU:
1. Remove power from the computer.
2. Visually check FRUs for damage. If any problems are found, 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
•DIMM
• CD-ROM/Diskette drive Module
• PC Cards
4. Apply power to the computer.
5. Determine if the problem has changed.
6. If the problem does not recur, connect the removed devices until failing FRU is found.
7. If the problem remains, replace the following:
• System board
• LCD assembly
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