hi all, i have a dell xps 430 with a radeon 4800 graphics card that that is artifacting and eventually hangs the machine on a blank screen. when i uninstall the device driver and allow windows to refind an install its driver everything seems to be fine for about 24 hours then it all starts happening again. any ideas why this might be happening and/or what i could do correct. i dont have a spare card but am considering this as an option, but bit pricey if isnt going to help. any help much appreciated.