Be Right Back, Uninstalling

So yesterday while playing League of Legends, my computer froze, and my screen turned off. I did a hard restart, and the Asus bootscreen has green vertical lines. I suspected overheating, so I cleaned out the dust in it, and replaced the thermal paste on the GPU. After uninstalling and reinstalling the driver a few times, even switching the port on the motherboard a few times, it won't work.

So BRBu I ask, Is there anything else I an do? or is it shot?

Ps. Its a EVGA 8800GT

My computer is literally doing this right now with a 9800, but if I let the card warm up enough, disable it in Device Manage and re-enable it it just works. It's really annoying when it happens every other boot though

Its dead. So I bought a 560 GTX