Strange sound from the power supply, what is the reason?

Question

Computers

After replacing the case and, accordingly, completely cleaning the entire computer, the PSU began to make strange sounds under any load. With a powerful load, the sound comes out louder. The sound is similar to an incomprehensible ear cutting squeak. At first I thought it was the fan itself. But as a result, no. It's something else.
sound > click

Answer 1

If the power supply itself beeps, then this is a reason to get nervous and rather change it. Because this is a signal that the BL is out of order, and these squeaks can be regarded as death rattles or a request to end its existence in our mortal world.
But seriously, this means that one of the key components of the PSU power supply has failed. Perhaps a Capacitor or something like that, in words it can not be explained in such a way.
Conclusion - If you do not understand Electrical Engineering, and you cannot fix this problem on your own, you should replace the PSU. Although I think it makes no sense to repair. In the service center, three skins will be removed and there will be 0 sense.
Accurate conclusion. Change the PSU before the PSU burns out and takes half or the entire computer with it.

Answer 2

Either the chokes are whistling (and this is normal), or there is noise on the speakers (try turning off the speaker power)

Answer 3

Most likely chokes. The solution is generally the same. Disassemble and fill with epoxy chokes.