I recently purchased a new computer with 4 gig of ram and an 8400 processor. I am running vista ultimate SP1. The computer kept crashing in world of warcraft. What would happen is that the screen would go blank, the hard drive would start running fast and I would still hill game noises for a few seconds and then the computer locked up with the sound looping real fast and the video card spinning up to max until I turned it off. I RMAed the video card and got an ASUS 4850 and reformatted the harddrive. I have tried drivers 8.5, 8.6 and the 8.6 hotfix for 4850. I am running the with the quality slider set to high. I have the fan set on 50% and the card only gets about 60 degrees. Is there anything I can do to try and find out what is wrong?