Action

1. Run POST diagnostics.

   See "How to Use POST Diagnostics".

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, tip connection, or RSC console.

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   Note -

   By default, POST output is displayed locally on an attached terminal or through a tip connection. If your server has been reconfigured to display POST output on an RSC console, POST results will not display locally. To redirect POST output to the local system, you must execute the OpenBoot PROM command diag-output-to ttya from the RSC console. See the Remote System Control (RSC) User's Guide for additional details.

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3. If you see no front panel LED activity, a power supply may be defective.

   See "Power Supply LEDs".

4. If the general fault LED remains lit, or 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.