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7.13.2 Power-On Failures
7.13.2.1 Symptom
The system attempts to power up but does not boot or initialize the monitor.
7.13.2.2 Action
1. Run POST diagnostics.
See Section 7.3 “How to Use POST Diagnostics” on page 188.
2. Observe POST results.
The front panel general fault LED should flash slowly to indicate that POST is
running. Check the POST output using a locally attached terminal or a tip
connection.
3. If you see no front panel LED activity, a power supply may be defective.
See Section 7.12.1.3 “Power Supply LEDs” on page 214.
4. If the POST output contains an error message, then POST has failed.
The most probable cause for this type of failure is the main logic board. However,
before replacing the main logic board you should:
a. Remove optional PCI cards.
b. Remove optional DIMMs.
Leave only the four DIMMs in Bank A.
c. Repeat POST to determine if any of these modules caused the failure.
d. If POST still fails, then replace the main logic board.
7.13.3 Disk or CD-ROM Drive Failure
7.13.3.1 Symptom
A CD-ROM drive read error or parity error is reported by the operating system or a
software application.
Diagnostics and Troubleshooting 227