Death of a mac?

I seem to have fixed it, some forum somewhere had some info, it's due to overheating, so I downloaded smcFanControl and upped the min CPU fan speed from 1000rpm to 2500rpm, seems to be ok so far...

You will void your warranty if Apple find this app on your machine when doing a repair. Be warned that bearings are put under more stress whilst using smc, try to get away with small adjustments, it'll probably be fine, just saying.