Robert S adjusted his/her tin foil beanie and asbestos underwear to
write:

I have a machine with a GA-K8N motherboard and AMD-64 3000+ processor,
running as a unattended server. Over the last couple of weeks it has
unexpectedly powered down, always in the middle of the afternoon.
There have been no messages in the system log.

I had a machine a couple of years ago used as a server that would do
that, turned out that the sun would shine on it at certain times of the
day and it would over heat, just moved it out of the sun and all was
fine.

HTH

--
Mark
Illegitimi Non Carborundum!
Twixt hill and high water, N.Wales, UK
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