I'm having some trouble with Minecraft. When I play Minecraft, after a while, my computer shuts off. With no warning at all, the screen goes black and the power button stops glowing. I have power connected to the computer and it shuts off. This can happen 5 minutes after I start mc or after an hour. No other games do it and when I'm not playing, it doesn't either. I'm currently running Vista. I'm not sure if its a heat issue. When playing MC, the core is abput 51 degrees celcius and the cpu is 61 - 65 degrees celcius. I've done everything I can, reinstalling, loading it with the tekkit launcher, turning down the video settings, running it as administrator, installing mods and cooling it down. I am also running it on a slower exe, so it doesn't use as much gb as the normal exe. It does this on the normal exe, the less exe and the tekkit lancher. It does this with mods installed and when they're not istalled. On singleplayer, I seem to be able to play for longer, but it always seems to shut down. I really need some help, I'm not sure if this is computer related or MC related, but I would like some help.