Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 177

4. Turn the system control keyswitch to the Diagnostics position.
5. Power on the system.
If the system does not boot, the system might have a basic hardware problem. If you
have not made any recent hardware changes to the system, contact your authorized
service provider.
6. If the system gets to the ok prompt but does not load the operating environment,
you might need to change the boot-device setting in the system firmware.
See "How to Use OpenBoot Information Commands" on page 94 for information
about using the probe commands. You can use the probe commands to display
information about active SCSI and IDE devices.
For information on changing the default boot device, see the Solaris System
Administration Guide: Basic Administration.
a. Try to load the operating environment for a single user from a CD.
Place a valid Solaris operating environment CD into the system DVD–ROM or
CD–ROM drive and enter boot cdrom -s from the ok prompt.
b. If the system boots from the CD and loads the operating environment, check
the following:
If the system normally boots from a system hard disk, check the system disk for
problems and a valid boot image.
If the system normally boots from the network, check the system network
configuration, the system Ethernet cables, and the system network card.
c. If the system gets to the ok prompt but does not load the operating
environment from the CD, check the following:
OpenBoot variable settings (boot-device, diag-device, and auto-boot?).
OpenBoot PROM device tree. See "show-devs Command" on page 23 for more
information.
That the banner was displayed before the ok prompt.
Any diagnostic test failure or other hardware failure message before the ok
prompt was displayed.
Chapter 7 Troubleshooting Hardware Problems 159