Why is the fan not spinning in the computer power supply?

Some users may notice that the fan in their power supply isn't spinning and become concerned. However, it's most likely not running because the computer is at an appropriate temperature and doesn't need to be cooled.

If your computer is under heavy load (gaming, video editing, etc.) and the fan never comes on, the PSU (power supply unit) may be faulty. To verify, check the motherboard connections and manually spin the fan to see if it rotates.

In most cases, if the power supply fan never spins, we recommend replacing it, as trying to open the device and repair it yourself is very dangerous. Furthermore, as fans help to cool down components and reduce overall temperature, failure to replace the hot PSU could result in additional damage to other internal parts of your computer.