[CentOS] System crash -- no clue why

Hi --

My CentOS 5.8 server crashed, leaving no clue why.  The
last entry in /var/log/messages is a dhcpd notice around
4:00am, followed by the restart message when I rebooted.
The only clue that I have is that the fan was running full
speed when I restarted it.  The fan slowed to normal speed.

Any ideas what I can do to find out the cause?

-- 
Michael Eager	 eager at eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077