Power Supply Failure; Dimm Failure - Sun Microsystems Enterprise 250 Owner's Manual

ok probe-scsi
If a message is displayed for each installed disk, the system SCSI controllers have
successfully probed the devices. This indicates that the main logic board is
working correctly.
2. If a disk doesn't respond:
3. If the problem persists, replace the unresponsive drive.
4. If the problem remains after replacing the drive, replace the main logic board.
5. If the problem persists, replace the associated SCSI cable and backplane.

Power Supply Failure

If there is a problem with a power supply, POST lights the general fault indicator
and the power supply fault indicator on the front panel. If you have more than one
power supply, then you can use the LEDs located on the power supplies themselves
to identify the faulty supply. The power supply LEDs will indicate any problem with
the AC input or DC output. See "Power Supply LEDs" on page 259 for more
information about the LEDs.

DIMM Failure

SunVTS and POST diagnostics can report memory errors encountered during
program execution. Memory error messages typically indicate the DIMM location
number ("U" number) of the failing module.
Use the following diagram to identify the location of a failing memory module from
its U number:
Sun Enterprise 250 Server Owner's Guide ♦ Revision A, June 1998
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