|Another issue you may have is that your thermal sensor could be bad. I have seen this happen before, though very rarely. |
Try removing the heat sink, and processor from the motherboard. Cleaning them ( I usually use cotton swabs dipped in rubbing alcohol and wiping away all excess thermal grease. Then after replacing the thermal paste *arctic silver is the way to go* I put the processor and heat sink back onto the motherboard. That will usually clear up any issues it may be having with the firmware thinking the processor is overheated.