Keyboard Or Auxiliary Input Device Check; Memory Check; Power System Check - Acer Extensa 500 Service Manual

2. Replace the CD-ROM drive.
3. Replace the system board.

Keyboard or Auxiliary Input Device Check

Remove the external keyboard if the internal keyboard is to be tested.
If the internal keyboard does not work or an unexpected character appears,
make sure that the flexible cable extending from the keyboard is correctly
seated in the connector on the system board.
If the keyboard cable connection is correct, run the Keyboard Test. See
"Running the Diagnostics" for details.
If the tests detect a keyboard problem, do the following one at a time to
correct the problem. Do not replace a non-defective FRU:
1. Reconnect the keyboard cables.
2. Replace the keyboard.
3. Replace the system board.
The following auxiliary input devices are supported by this computer:
Numeric keypad
External keyboard
If any of these devices do not work, reconnect the cable connector and
repeat the failing operation.

Memory Check

Memory errors might stop system operations, show error messages on the
screen, or hang the system.
1. Boot from the diagnostics diskette and start the PQA program (please
refer to "Running PQA Diagnostics Program".
2. Go to the diagnostic memory in the test items.
3. Press F2 in the test items.
4. Follow the instructions in the message window.
Note: Make sure that the DIMM is fully installed into the connector. A
loose connection can cause an error.

Power System Check

To verify the symptom of the problem, power on the computer using each of
the following power sources:
1. Remove the battery pack.
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