There is noise in the chassis. How to judge which part of the fan is the cause?

* * * Three fan power supplies, one cpu and one graphics card. If you want to mute the graphics card, you can configure a large radiator. There's probably nothing the cpu can do about 40 yuan. There is no such thing as a mute fan. Try an advertising slogan. Most fans are silent, but they are dried with lubricant. You can remove the fan and put some lubricating oil on the shaft, so it will be silent. If it is a power supply, it is very complicated. Just pay attention when you dismantle it.