New Built PC, Freezing/Crashing Problems

sirthinh

Distinguished
Nov 24, 2011
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18,510
Hello, I built a new PC on Windows 7 64 bit about a month ago, but its having problems with freezing and crashing. Screen turns black and sound freezes, no blue screen. I have to manually turn off PC and restart.

It usually happens during relatively low-load. Froze once while watching a YouTube video, but mostly while I'm playing games like WoW or DotA 2 2-3 hours in which don't take much to run anyway. CPU temps are usually under 50, GFX is under 70. Everything still factory clocked and it did happen when I was running 1x Video Card as well.

Intel i5-3750K
2x Sapphire Radeon HD 7870
Asus P8Z77-v LX
Corsair Vengeance 2x4gb
Corsair TX 750 watts
Samsung 830 256gb

What could be the problem?