I can't tell if my gpu is dying or maybe its memory issues or my PSU or something. When playing games I can usually play for up to 30 minutes to an hour then the game crashes, my browser crashes skype crashes ect. The manner in which this happens is glitchy sounds followed by a crash to desktop with program not responding. I can't re open any programs until I restart my computer. If I try it just gives me a not responding window as well as graphical glitches on the programs ie. rainbow colours, black boxes and random lines. This only started happening after I installed windows 7. Was running XP prior. This has only been happening for a few days. Also my temps are fine, nothing is over-heating so I don't know what is happening. Any responses are greatly appreciated. Thanks!