Why are the speakers and headphones on the computer phoning?

Question

Audio

The PSU on the computer made a lot of noise, they advised to lubricate the cooler, disassembled, lubricated, assembled - the speakers and headphones began to flicker. I disconnected the microphone from the connector - the headphones stopped phoning, and the speakers simply began to fonn less, tell me how to solve the problem.
Thanks in advance.

Answer 1

most likely somewhere there is a short circuit to the body of the sound outputs, look for and remove it.

Answer 2

I now have a similar problem on a monoblock - I don’t know how to solve it at all, so I join the question.

Answer 3

Thanks for the answer - indeed, the sound outputs from the inside of the system unit were in contact with the case, and the microphone just covered itself

Answer 4

The background, most likely, appears when the connector contacts the metal of the computer case (monoblock).