Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 180

b. Press the system Power button for five seconds.
This causes an immediate hardware shutdown.
c. Wait at least 30 seconds; then power on the system by pressing the Power
button.
Note – You can also use the ALOM system controller to set the POST and OpenBoot
Diagnostics levels, and to power off and reboot the system. See the Sun Advanced
Lights Out Manager (ALOM) Online Help.
7. Use the POST and OpenBoot Diagnostics tests to diagnose system problems.
When the system initiates the startup sequence, it will run POST and OpenBoot
Diagnostics tests. See "How to Isolate Faults Using POST Diagnostics" on page 65
and "How to Isolate Faults Using Interactive OpenBoot Diagnostics Tests" on
page 67.
8. Review the contents of the /var/adm/messages file.
Look for the following information about the system's state:
Any large gaps in the time stamp of Solaris software or application messages
Warning messages about any hardware or software components
Information from last root logins to determine whether any system administrators
might be able to provide any information about the system state at the time of the
hang
9. If possible, check whether the system saved a core dump file.
Core dump files provide invaluable information to your support provider to aid in
diagnosing any system problems. For further information about core dump files, see
"About the Core Dump Process" on page 113 and "Managing System Crash
Information" in the Solaris System Administration Guide, which is part of the Solaris
System Administrator Collection.
162 Sun Fire V440 Server Diagnostics and Troubleshooting Guide • July 2003