Hi all . I have a new hp computer a p533 with an AMD athelon II x2 250 processor. I took out the cheap 350 watt power supply and put in a 600 watt PS. then I also installed and HATI Radeon HD 5570 PCi-E Video card. the game im playing is bioshock and dark strider. after about half hour of play my screen crashes to the desktop or I get a autoreboot. now, HP has a whole lot of ways to check the validity of a harddrive and video card and memory etc , so I did all the check s and nothing seems to be wrong. but i went out and bought a new harddrive any way . A Seagate Barracuda 1 TB/TO 7200 rpm with 32 MB cache. I am wondering if I should replace my drive or what cause the crashes are bugging me , especially screen freezing in the middle of gaming. help me out here someone?