I wasn't too sure where to post this, but I figured I'd post here since it may be specific to the model of computer) I made a post several months ago about my computer having problems where it would stutter while playing games, then reboots itself. I never figured out the problem, but never considered overheating. In fact I denied that possibility for a while but coming to the realization that it could be it. Now heres my history with gaming using my iMac that I purchased in 2007: in Mac OSX: World of Warcraft - only game I've played and NO problems at all. Windows: Warhammer Online: Age of Reckoning - This is when the problems first started. I would play and after a period of 30 minutes to 6 hours (it was random, which steered me away from the overheating theory, since why would it overheat sometimes but not at others?) Everquest 2 - Same exact issue. Team Fortress 2 (Any games in the Orange Box included) - Never had issues Perfect World International - Once like every month I'll crash to reboot, and it may overheat but not sure. It works real well when it works though. There are others I played but these are the ones I've been doing extensive testing with and got these results. My system specs are good enough to run all of the games mentioned, and in most cases way above recommended. So right now I pin point the problem to overheating to which I ask: 1. Is overheating playing games (in Windows) a known issue for iMacs? I say (in Windows) because I assume that since the game is made for MacOSX it will have better stability which is why WoW never crashes. 2. If so, is there a solution to this issue (other than buying a PC, seriously) 3. If this isn't a known issue, is there a still a solution? I figured this wouldn't be a problem for me, but most PC games I want to play do not offer trials so the only way to see if a game works or not is to buy it and if it crashes constantly to an unplayable point, I wasted my money.