Screen going black or vertical lines covering screen

Basically when play games(even low end games) my screen will either go completely black and I have to manually shut it off or these vertical lines will completely cover the screen.

Here's a picture of the vertical lines:



I just put in some new fans and the temperatures inside my computer are fairly low. I've installed all the drivers for my graphics card.

Here's my specs:
Radeon HD 5700
AMD Phenom II X3 2.8 GHz
4 gigs of ram
500W PSU
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