Possible GPU failure?

My friends computer has an 8800GTS which may have failed. He was playing a game of League of Legends when it froze halfway through and he had to hard reboot. Now when he turns his computer on he gets a bunch of blue lines over his screen but can still log into windows normally.

I assume it overheated and possibly fried but I'm not sure. Had him check to see if the fan is working and reinstall drivers but to no avail. Looking for any other ideas.