HP system is rebooting unexpectedly

Issue

• HP system is rebooting unexpectedly

Sep  8 04:02:01 bakmedrdc09d syslogd 1.4.1: restart.
Sep  8 07:16:17 bakmedrdc09d syslogd 1.4.1: restart.
Sep  8 07:16:17 bakmedrdc09d kernel: klogd 1.4.1, log source = /proc/kmsg started.
Sep  8 07:16:17 bakmedrdc09d kernel: Linux version 2.6.18-308.el5 (mockbuild@x86-007.build.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Fri Jan 27 17:17:51 EST 2012
Sep  8 07:16:17 bakmedrdc09d kernel: Command line: ro root=/dev/vg_root/lv_root pci=bfsort crashkernel=128M@16M selinux=0

• There are no pointers in log-messages regrading the system reboot.