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Chapter 7 Diagnostics and Troubleshooting 149
Power-On Failure
Symptom
The system attempts to power on but does not boot or initialize the terminal or
monitor.
Action
1. Run POST diagnostics.
See “How to Use POST Diagnostics” on page 121.
2. Observe POST results.
The front panel general fault LED should blink 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 “Power Supply LEDs” on page 141.
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.
Video Output Failure
Symptom
No video at the system monitor.