I have an odd prob that I cannot find the solution to. I built my rig in July/August and I've the same prob since. Every few hours, often days (or I would have done something about it sooner), it freezes. The video output freezes and I am forced to power down. I never receive an error message or see a blue screen or anything.
Specs of the PC are as follows
Scythe Mugen 2 Rev B
Intel Core i5-2500k
Asus P8Z68-V PRO
Corsair Memory XMS3 (2x4GB) Memory Kit (CMX8GX3M2A1600C)
Intel 120GB 320 Series SSD
Samsung Spinpoint F3 1TB
Windows 7 Ultimate x64
2x 1GB MSI GTX 460 Cyclone
The only other symptom is that the sound from both the front and back panel outs will cut out momentarily every 10-20min or so. But it’s brief enough for it not to bother me too much.
OK. With the addition of two GTX 460's it sounds like it could be a power supply issue. First thing I would do is check to see if there are newer drivers for your motherboard (check the manufacturer's web site). Install any newer drivers and see if the problem persists.
If it does, then I'd probably download and run Memtest86 to check your memory. If the memory test shows no issues, then remove one of the graphic cards and see if the problem persists. If it does, swap graphic cards and retest.
I know you said it sometimes takes days for it to crash. I'm kind of doubting it's one of the graphic cards, but we should make sure.
If you go through all of this and the issue still occurs, that pretty much narrows it down to either the power supply or the motherboard. At this point, I'd probably try swapping power supplies and/or doing power tests from the wall socket.