I have a friend's MacBook that just gives the Gray Screen of Death on boot, combined with the fans running at "jet airliner taking off" speeds. I've tried everything to get it too boot: Safe Mode ...

I have a powermac g4 tower, I am not sure exactly which one (it's light gray, no grooved front or mirror doors, hole for a speaker... I think it' a g4/866 or some odd number) Yeterday we had a ...