Undetermined Problems - Lenovo IdeaCentre D400 Series Hardware Maintenance Manual

Undetermined problems

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If the diagnostic tests did not diagnose the failure or if the home center is
inoperative, use the information in this section.
If you suspect that a software problem is causing failures, see the User Guide.
Damaged data in CMOS memory can cause undetermined problems. To reset
the CMOS data, use the CMOS jumper to clear the CMOS memory.
To reset the CMOS data:
1. Power off the home center and all external devices.
2. Unplug all cables and power cord.
3. Place the home center on a flat, stable surface.
4. Remove the cover. Refer to "Removing the cover".
5. Locate the JP1 CMOS jumper on the system board.
6. Move the jumper cap from pins 1-2 (normal) to pins 2-3 (clear CMOS).
7. Keep the jumper cap on pins 2-3 for 5 to 10 seconds, then move it back to pins 1-2.
8. Replace the cover.
9. Plug in the power cord.
10.Turn on the home center.
Check the LED indicators on the front panel, which can indicate the malfunction.
See the User Guide for information about the LED indicators.
If the LEDs indicate that the home center is not working correctly, complete the
following steps.
1. Power-off the home center.
2. Remove or disconnect the following components (if installed) one at a time.
a. Any external devices
b. Any adapters
c. Hard disk drives
d. Memory module
e. Fan module
Chapter 5. Symptom-to-FRU index