Core duo mini crashing occasionally - how to find the cause?

My core duo Mac mini crashes itself every now and then. The screen goes blank for a couple of seconds and the machine reboots with no explanation. This happens about three or four times a month. It has happened in the middle of the night with no active load in the machine, and also while me using it in the front of console. No warnings, no strange behaviour before the crash, just a sudden blank screen and reboot with no extra messages.
I'm looking for the cause but I can't find any hardware related errors from system.log, dmesg or console.log. Is there some other log file that I should consult to see whether the crashes are hardware or software related?
Any debug programs I should run to get more specific info to be collected just before the next crash? Crash dumps and a debugger?
I ran Mac diagnostics and some 3rd party memory test programs with no errors.
1.66GHz Intel Core Duo, 1GB RAM Mac OS X (10.4.6)

It sounds like your power cord may not be firmly
inserted. Check to make sure nothing is fraying or
loose about it before starting up the machine.
Checked. Also, the Mac Mini has been in two locations with the same symptoms; all the cords have been replugged and rechecked.
In addition, since it has happened several times,
have you checked to make sure the directory is fine
with Disk Utility's Verify Disk?
Yes, no problems there. Luckily the Disk Utility has not found any problems after the crashes.

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If I have helped you, why not giving me a kudos?

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