I bought a GTX 760 from a friend around a month ago. I installed it and everything was working perfectly until yesterday. I knocked my computer slightly and it restarted. After it restarted it was behaving differently and I noticed a few pink and green pixels on my screen. I run a game but when it opened the monitor became completely messed up. The whole screen was glitching. I closed the game and my PC restarted. This has continued. I have done a bit of research and I have come to the conclusion that my GPU is damaged. I have uninstalled and reinstalled the drivers which has made no difference. Is there anything I can do or will I have to get a new GPU?