Hey there. I've had this problem with my Alienware for about three years--and Ive had it for three years. The reason why I haven't been so gung-ho about fixing the issue is because its pretty sporadic. Anyway, my alienware seems to shut down with no warning when I start playing games (ie: WoW) or generally start using my NVidia card. AT first I thought it was over heating, but all of my fans are working. I bought a new power supply, cleaned out my computer, and made sure there was no dust around the fans, but still this problem persists. Now, I think its either the power button or the graphic card. (I heard a rumor that the NVidia drivers had a bug that dealt with the temprature of the card.) Like I said, my temperatures have all been in the average range. I've also done almost every test known to man for this computer, too. From memory to stress testing it, but it all comes out with flying colors. There are no viruses or malware, and I changed my RAM placement twice, just to make sure. Here are the specs: ABIT motherboard (AA8XE 6800 NVidia Geforce Ultra 2 gigs of RAM 120 gig hard drive I think thats all you need? So what do you think. Anyway help would be awesome.