You can use the prtdiag command to display:
System configuration, including information about clock frequencies, CPUs, memory, and I/O card types.
Diagnostic information
Failed field replaceable units (FRUs)
Refer to the prtdiag man page for instructions.
To isolate an intermittent failure, it may be helpful to maintain a prtdiag history log. Use the prtdiag command with the -l (log) option to send output to a log file in the /var/adm directory.
% /usr/platform/sun4u/sbin/prtdiag