Dying U60

My Sun workstation (an Ultra 60) has started powering itself off after
about 20 minutes of use. There's no warning, no error messages, nothing
in the logs, it just powers down. If you switch it off and on again, it
comes straight back up, but does the same thing after a much shorter
time. On the third attempt, it didn't even have time to boot up before
doing it again.

I have a suspicion that it's temperature related, therefore. Any
suggestions as to where to look? I haven't had a chance to take it to
pieces yet (although I have downloaded the service manual (Ghod bless
the web)). I initially assumed it was a faulty power supply, but I
wonder if some of the fans have failed ...

I've bought a whole new machine on eBay - it was half the price of a
new power supply, so I should be able to assemble an entire working
machine out of the two, by a process of elimination, if all else fails.
(We also have three U60's in the "demise" pile at work, but it's a royal
pain getting them home. They're too heavy to carry on the train, and
driving into London is the pits.)
.

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