First of all, the cooling fan inside the computer may make a knocking sound. When the computer is running, long-term use will cause the internal temperature to be too high, and the cooling fan will start to run, making a rumbling noise. In this case, try cleaning the dust on the cooling fan or replacing the cooling fan.
On the other hand, the hard disk may also cause the computer to knock. Hard disk will produce sound when transmitting data, but if the sound is too obvious or irregular, it is likely that there is something wrong with the hard disk. If your computer or hard disk is used for a long time, there may be knocking caused by the aging of the hard disk. In this case, you should consider replacing the hard disk.
In addition, there may be something wrong with the computer's memory or graphics card, which leads to knocking sound. If your computer has upgraded its memory or graphics card, it may be caused by incorrect installation or incompatible hardware. If you need to reinstall the memory or replace the graphics card, you can seek professional help if you don't want to operate it yourself.
In a word, there are many reasons for computer knocking, so it is very important to choose different solutions according to the situation. If you are not sure how to deal with it, it is best to consult a professional to help diagnose and provide a solution.