How To Fix Fan Not Spinning. If your CPU fan is not working it is a serious cause for concern. There are 5 ways to fix the issue.

If the CPU fan isnt spinning it is likely that it has been disconnected check to see if its cable is connected to the four pins near the CPU slot on the motherboardThis needs to be connected in order for it to run and without it the temperature of the CPU will very hot because most CPUs cannot work even on moderate loads without a Fan. Explanation on how to fix an air conditioner unit or outdoor heat pump fan that is not working due to a bad capacitor. Even after you remove the dust the fan will stop running to prevent itself from burning.
CPU Fan not Spinning is one of the worst problems that you can face in your computer.
It also runs at different speeds. The fan can become faulty either because it is jammed due to dust or due to hardware failure that includes worn out bearings or because of some component failure in the fan. CPU Fan not Spinning is one of the worst problems that you can face in your computer. I cant careless sadly.
