Hi and welcome to the forum
Did you put new thermal paste on?
Could be that you do not have the CPU fan plug on the right end of the motherboard header so the motherboard is not detecting a fan & not starting to save you from burning your CPU
Try putting the fan plug on the other 3 pins and see if that makes a difference
Good luck
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Asus M4A79 Deluxe, Phenom II 940 BE, 20,770 3D06Asus Moderator ~
My CPU Overheating Guide