[H] Overheating laptop

[Thane Sherrington]

I have a laptop that is running about 50C (according to Speedfan, 
which may be off somewhat) when it is idle, but when I bring the CPU 
load to 100%, within two minutes it reaches 104C and shutsdown.  I 
have cleaned the heatsink and replaced the thermal compound, but that 
made minimal change.  I've tried a newer BIOS, as it had some power 
fixes, but that made no difference.  Is it the heatsink itself, or 
could the CPU be failing and running abnormally hot?

T