It sounds as if the cooling system is doing its job and just isn't up to the task of keeping it cool under a heavy load. WIth the CPU idling the air coming out should be lukewarm. and the fan should be silent.
Video encoding and games put the heaviest load on a computer.
Laptops with their compromise size cooling systems are not good for either.
They keep the size and weight down in laptops. The average laptop cooler is much smaller compared to a desktop cooler for an equivalent CPU & GPU
This why I suggest using a desktop unless you need to be portable.
It is also possible that since the CPU is only hitting 30% that the GPU is overheating instead.
I suppose a cooling pad doesn't help?
Also keep in mind that running so hot it shuts down will drastically shorten the laptops life. I've replaced laptop motherboards that were killed by always running hot. One was just from needing a cleaning and the other was from a failed heatsink assembly. However the common denominator was that the owners kept using them even though would get so hot they shut down.
Edited by rotor123, 30 May 2012 - 10:36 AM.