I've been reading up all over the place and anything I can find about this issue, and nothing is quite matching (that I know of, I'm not very tech savvy). First time it did this was when I opened a game on my desk top my screen froze and most of the graphics turned fuzzy with dark pink and bright green highlights, I could probably go as far as saying pixeled since it wasn't huge blocks it was tiny. I could not get my computer to boot up after this for about an hour so I left it alone. Two hours later I tried again and it worked for a little while. While browsing graphic card problems my screen froze again this time with decent sized rectangular blocks with a lot of pink. Again my computer wouldn't come back on. Well now my computer has been on for about twenty minutes and so far so good. I highly doubt this is heat related since I basically have a swamp cooler (literally) behind my computer as well as my sides off. It gets plenty of air. Help?