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 bedefective.
See Section 7.12.1.3 “Power Supply LEDs” on page214.
4. If the POST output contains an error message, then POST has failed.
The most probable cause for this type of failureis the main logic board. However,
before replacing the mainlogic board you should:
a. Remove optional PCI cards.
b. Removeoptional DIMMs.
Leave only the four DIMMs in Bank A.
c. Repeat POST to determine if any of these modules caused the failure.
d. IfPOST 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.
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