Sun Microsystems Enterprise 250 Owner's Manual page 271

Before You Begin
You can choose to view POST diagnostic and error messages locally on an attached
terminal or remotely on an RSC console.
To view POST diagnostic messages on the local system, you need to connect an
alphanumeric terminal or establish a tip connection to another Sun system.
For more information, see "About Setting Up a Console" on page 49.
To view POST diagnostic messages remotely on an RSC console, you need to
configure the RSC software before starting POST. For information about using the
RSC software, see the Remote System Control (RSC) User's Guide.
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 issue the OpenBoot PROM command
diag-output-to ttya from the RSC console. See the Remote System Control
(RSC) User's Guide for additional details.
You can choose to run an abbreviated POST with concise error and status reporting
or run an extensive POST with more detailed messages. For more information, see
"How to Set the Diagnostic Level for POST and OBDiag" on page 250.
What to Do
1. Ensure that the front panel keyswitch is in the Standby position.
For descriptions of the various keyswitch settings, see "About the Status and
Control Panel" on page 6.
2. Turn the keyswitch to the Diagnostics position.
The system runs the POST diagnostics. POST displays status and error messages
on the system console or on an RSC console, if the RSC software is configured to
display POST output. For more information, see the "Results" section below.
Upon successful completion of POST, the system will run OBDiag. For more
information about OBDiag, see "About OpenBoot Diagnostics (OBDiag)" on page
239 and "How to Use OpenBoot Diagnostics (OBDiag)" on page 248.
Results
While POST is running, you can observe its progress and any error indications in the
following locations:
4 System console or Remote System Control (RSC) console
4 Front panel fault LEDs
Diagnostics and Troubleshooting
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