My PC is crashing

Blooblood1112

Honorable
Feb 5, 2013
51
0
10,630
When I'm on my pc the screen will randomly change to a solid color (suck as blue, orange, green etc) then my pc will reboot itself? I just got a new graphics card and PSU like 2 months ago but it was working fine until 2 weeks ago. I am only running 1 monitor. My pc specs are

GC: Gtx 650ti 2gb
PSU: Dynex 520w ATX
OS: Windows 7 home premium 64bit
CPU: Amd phenom ii x4 960t
Hard Drive: 1.5tb

Please help me!

Thanks!