When I first switch on my PC in the morning, it runs find for about 20
minutes and then powers off in a blink of an eye - total "OFF" - no
controlled shutdown. If I then switch the power switch off for ten
seconds, then back on and then hit the "on" button the PC powers up and
works continually until I choose to shut it down.

What are the first things I should be looking for here? I already installed
Linux's lmsensors and am seeing no outrageous over heating or anything.

Could it be SW related?

"Hadron Quark" <hadronquark (AT) gmail (DOT) com> wrote

Check PSU fan running OK, test with another PSU.
Mike.

Previously Hadron Quark <hadronquark (AT) gmail (DOT) com> wrote:


Unlikely. Most likely a problem with the PSU. Second candidate is the
mainboard, but rather unlikely.

Arno