As I stated in the title my laptop will randomly shut down (not a proper shut down just the screen goes blank and everything turns off), I think this is due to overheating but sometimes I can turn it straight back on again and it'll have no problems for another few days, however sometimes it will boot into windows and do this again, however it NEVER does this before I've logged into vista, I usually have to leave it to cool down for half an hour or so after that. Sometimes it does this but it won't boot up for an hour or so, it does seem to be running quite hot when this happens. I get this happening to me less when it's on a desk, but it still happens sometimes. I have a notebook cooling stand that I use when gaming/ just after it does this in-case overheating is the problem but I'm not sure what the problem actually is. I'm guessing it might be due to it warming up which means there's higher resistance in the parts which means they need more power to work properly and my PSU or whatever it would be in a laptop can't handle it and dies since there's no difference in this problem between my gran's house where the heating's constantly on (something over 20 degrees) and my house where the heating's rarely on (usually around 12 degrees at home I think, I'd have thought this might make a bit of a difference to overheating but don't know. Anyone have any idea why this might be happening and/or a way to fix it?