Sun Microsystems Enterprise 250 Owner's Manual page 269

The following chart provides an overview of when to use the various diagnostic
tools to diagnose hardware problems.
Figure 12–1
About Power-On Self-Test (POST)
Diagnostics
The POST diagnostic code resides in flash PROM on the main logic board. It runs
whenever the system is turned on or when a system reset is issued. POST tests the
following system components:
Diagnostics and Troubleshooting
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