I have a ati radeon sapphire pro 512mb vid card and im having this wierd shutdown problem where everytime i play a game, my pc shuts down soon after. Its not just games, i can be listening to music, or watching a movie. I figure its the video card because i have tested everything else. I know my pc is not over heating because i turned off the overheating temperature in my bios. I also put in another fan that mounts to the motherboard and i can aim it at whatever in my case.I know its not my operating system because it has shut off in the bios before the os has even booted, and i've even formatted and reinstalled windows to double check. I know its not my processor because i have bought a new one and tested it and it still sht down. My pc system includes 2 hard drives, 1 40 gig as primary, and 1 80 gig as slave. 1.5 gigs of ram, ddr2 memory. 500 watt atx power supply, and my ati radeon 512 video card. When i remoived the video card, it shut down after 7 hours instead of the 2 minutes, and after the first shutdown, it completly stopped. I dont think its the power supply because my cousin has the same problem with i beleive an ati video card and has switched his powersupply. I may be wrong, but i need some more opinions. If anyone can help, please e-mail me at firstname.lastname@example.org or jus reply to this.