Overheating with low temperatures?!?

I have a strange situation with my build.

Worklog is here:

http://www.xtremesystems.org/forums/...agon-SFF-build

My computer runs fine for about 10 minutes and shows low temperatures. Like 120 degrees F for the CPU.

Then, without warning, the entire system powers down. Suddenly and unexpectedly.

When I press the power button after this shutdown, it powers up briefly -- lights, fans -- then immediately powers down again.

If I wait a few hours for the system to completely cool down, I can power it up again and it works fine for about a dozen minutes before completely shutting down without warning and refusing to power on again.

I installed a blue screen viewer and found no blue screens at all.

Any idea what could be causing this behavior?

I would suspect the power supply but you can try updating the bios.

I ran the self-test on the power supply and got a green light on it.

I think clogged micro-channels on the CPU water block from the previous red-dye coolant degrading. I'm going to take apart the cpu block a second time and see what it looks like and either clean or replace it.

I think I may have figured it out. I reassembled the CPU block incorrectly. I had the flow across the micro channels instead of through them. And they're a bit clogged. Maybe time for a new cpu block.