Rainbow Colored Crashes

[Dulanic]

A few weeks ago my video card was occasionally getting rainbow colored patterns on the screen. It would happen while booting up and happen from loading the BIOS all the way to when windows would load then when windows loaded my monitor would go into standby mode. A few reboots would fix it. It no longer does this on bootup, but now it occasionally does it in 3D apps. I had the video card overclocked but not anymore. I'll be playing Planetside or other various games (Its not specific to a few games) and my whole screen just becomes a rainbow pattern and it hard locks my PC. Any ideas? I've reseated my video card and it hasnt seemed to help. See my sig for system info.