Power-On Failures - Sun Microsystems Enterprise 250 Owner's Manual

ok
nvedit
0: probe-all install-console banner
1: apply disable-link-pulse device-name
(Repeat this step for other device names as needed.)
(Press CONTROL-C to exit nvedit.)
ok nvstore
ok setenv use-nvramrc? true
2. Reboot the system to make the changes effective.

Power-on Failures

Symptom
The system attempts to power up but does not boot or initialize the monitor.
Action
1. Run POST diagnostics.
See "How to Use POST Diagnostics" on page 236.
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.
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.
3. If you see no front panel LED activity, a power supply may be defective.
See "Power Supply LEDs" on page 259.
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:
Diagnostics and Troubleshooting
269