Originally Posted by: LordathestringsThat sounds like a hardware thermal problem. Check your CPU fan. The processor may be overheating.

Ok, thanks, I'll give it a shot.

Dumb question... how the heck do ya open up the case?
I can't see any visible way of accessing the inside.
There's one small plastic screw but undoing it doesn't seem to have any effect.
I can't see any screws holding the case in place either.