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 "7.3 How to Use POST Diagnostics".

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 "7.12.1.3 Power Supply LEDs".

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:

   1. Remove optional PCI cards.

   2. Remove optional DIMMs.

      Leave only the four DIMMs in Bank A.

   3. Repeat POST to determine if any of these modules caused the failure.

   4. If POST still fails, then replace the main logic board.