Need help with Reboot cause

[Peter J. Stieber]

PS = Pete Stieber
PS>> This is going to sound vague, but here goes...
PS>>
PS>> I have a dual opteron system that has been acting as the
PS>> worldly node for a small cluster of computers since
PS>> September, 2004.  The machine is running the latest
PS>> x86_64 Fedora 10 kernel that I recently loaded (April
PS>> 2).  The machine reboots without warning.  I can't find
PS>> the cause in log files (maybe I'm not looking in the
PS>> correct log).
PS>>
PS>> I'm currently running memtest.  If all of the tests pass,
PS>> could the community suggest other diagnostic tasks or
PS>> information I could post to help diagnose the problem?
PS>>
PS>> I wish I could be more specific,

AW = Anne Wilson
AW> I'd tend to put my money on the PSU.  Do you have a spare
AW> one that you can try?

No, but that would be a good guess.  Maybe I'll see if I can order a 
spare.  Anyone have a way of testing this without a spare?

Thanks Anne,
Pete