If the fan in the PC power supply unit suddenly makes noises that could not be heard before, this is not always an indication of a serious defect. First of all, follow our suggested solutions to locate and fix the strange noises.
Reduce fan noise from the PC power supply unit
© Be Quiet
If the noise from the power supply unit sounds rather loud and harsh, then open the PC case and check whether the integrated fan of the power supply unit can rotate freely. Because it can sometimes happen that, for example, a cable inside the PC has sneaked past the protective grille and hangs into the fan. Pull it out to fix the problem.
It becomes more difficult if the source of the noise lies in the power supply unit itself. If the device is still within the warranty period, contact the manufacturer so that he can take care of it. If the warranty has expired, you can unscrew the power supply yourself. Just make sure you’ve completely unplugged it for a few minutes before you screw it on. Then just check whether any cables of the internal electronics have got lost in the fan raceway and rectify the problem. You should leave everything else alone and rather pass it on to a specialist.
The power supply fan can be lubricated afterwards. The measure ensures that the computer runs more smoothly again.
A whirring, harsh noise is more a sign of a worn fan bearing. This occurs especially with older or particularly cheap power supplies. You can remedy this problem by relubricating the bearing, for example with gun oil, as it does not thicken or even oxidize even after a long time. Alternatively, you can also completely replace the fan – provided you can find the corresponding spare part. Not every case fan fits into your power supply.
However, if the noise is more like a rattle or vibration, then you should take a look at the screws that secure the power supply to the case. Sometimes PC manufacturers don’t fully tighten the screws. It also happens that they loosen up a little on their own over time. The movements of the fan can cause vibrations that make the screws rattle.
The fan of a PC power supply unit cools the internal electronics. If it turns on permanently because of dirty inlets and outlets, wear is high.
If it sounds as if the fan is simply rotating particularly loudly due to a very high rotational speed, then check the air inlets and outlets. Because a power supply unit shovels in fresh outside air with the help of the fan in order to cool the internal electronics. However, after a certain time and depending on the environment, the designated inlets and outlets can become clogged by dust and dirt.
This affects the airflow, the internal components heat up faster, and as a result the fan rotates faster to draw in more fresh air. Frequent cleaning of the inlets and outlets is a good preventative measure. Important: The power supply unit must be installed “the right way round”, i.e. the side with the fan (grille) must face the ventilation slots in the installation position in the housing so that fresh air can also be sucked in. Another tip: Avoid placing the PC on a soft surface, as this can block the air supply.
The right power supply: Your PC will always run stable