zig wrote:

The fans (2) are running,

Good.

the case is open all the time.

Bad!

 I doubt it's a heat related issue.  The mainboard is running at 50C/122F and the CPU is currently 63C/146F.

That's hotter than this air cooled system: 42C CPU, 32C System, despite +5% overclocking and 100% utilisation.

 There is no visiable dust.

Good, keep the dust and black stuff off and out of it.


Note: You require *airflow* going *through* your box. Make sure the fans are forcing the air in the right direction and put the sides back on your box. If the temps don't go down a little, then fix your fans and vents.


> I uninstalled the APC software.

Wonderful MS and MS apps reliability issues?


Good luck,
Martin