IBM System X3650 unexpectedly reboots with no messages.

Issue

• IBM System X3650 unexpectedly reboots with no messages.

Sep  1 18:52:06 server01 insight: OS85001S [server01:@SYS] Target [tjba01/NEOJAB:pisoagt] Status: Restarting
Sep  1 18:52:06 server01 insight: OS85001S [server01:@SYS] Target [tjba01/NEOJAB:audmond] Status: Restarting
Sep  1 18:53:06 server01 insight: OS85001S [server01:@SYS] Target [tjba01/NEOJAB:pisoagt] Status: Started
Sep  1 18:53:06 server01 insight: OS85001S [server01:@SYS] Target [tjba01/NEOJAB:audmond] Status: Started
Sep  1 19:03:08 server01 xinetd[7172]: START: telnet pid=16634 from=10.7.150.185
Sep  1 19:31:09 server01 xinetd[7172]: EXIT: telnet status=0 pid=16634 duration=1681(sec)

...reboot here...

Sep  1 21:35:28 server01 syslogd 1.4.1: restart.
Sep  1 21:35:28 server01 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Sep  1 21:35:28 server01 kernel: Linux version 2.6.18-92.el5 (brewbuilder@ls20-bc2-13.build.redhat.com) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-41)) #1 SMP Tue Apr 29 13:16:15 EDT 2008
Sep  1 21:35:28 server01 kernel: Command line: ro root=/dev/vg00/lvol000 rhgb quiet crashkernel=256M@16M