Computer is dust sucking machine! If you ever open the system case, you will agree with me.
Dust is the number one killer for fans, and there are usually many fans inside the system case. As time goes by, the fans will die. A natural solution (or workaround) is to spray WD40 there.
However, be warned if you do this with your CPU fan. WD40 is excellent to fix those fans, especially to solve those dust issues, however, it is also a great dissolver! A great dissolver to the thermal paste beteen your heat sink and your CPU! Once those thermal paste was dissolved, the function of the heat sink will become very weak, so the temperature will increase quickly.
Therefore, remember not to apply WD40 to your CPU fan, or even anywhere near the CPU.
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