Welcome to the forums, newcomer!
We're going to need a little more information in order to move forward. Please list the specs to your build like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
How do you mean that the processor isn't heating up? Are you actively cooling the processor? Inspect the CPU socket for any bent or broken pins. Age of the PSU being used?