My Laptop keeps shutting down when I'm in the middle of
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EDIT: No, seriously, it keeps turning off... I think its something to do with the processor overheating because they're bunged up with crap. The model is a Toshiba satellite A30. I've tried to open up the processor bit to get at the fans, and although I can undo the screws, the cover still stays on and it's quite flimsy, so I don't want to tug on it in case it breaks.
Any help?