Can you hear how the “computer works” why?

Question

Iron

When you move the mouse around the screen, for example, or put the files to be packed by the archiver, then a crack appears in the columns, if this is interference, it's not clear. But, if you restart the computer, then after entering the BIOS there are no sounds, and before the audio driver is loaded, there are no extraneous sounds in the system either. I read on Habrahabr advised to turn off PC-BEEP, turned it off, but the situation has not changed, there is still "the sound of the computer". Who faced it?
PS Line-In also turned off, tried 2 different drivers

Answer 1

Check the same with headphones. If the problem is observed only in the speakers, then the wire going to the speakers works as an antenna and catches pickups, and then the amplifier built into the speakers amplifies this.
In this case, it is solved by replacing the wire with a shielded one. Sometimes it is enough just to put it in a different way, away from the system unit.

Answer 2

put filters on the wires going to the column. change the capacitors on the boards. but it doesn't really help.
between the beeper and the microcircuit of the audio codec, the relationship is approximately the same as between St. Petersburg and Khabarovsk.
option 2: just shitty circuitry in the motherboard. try to put a good usb-zvukovuhu on a 2-meter usb cable with a filter at the ends.

Answer 3

I have had this + just a constant noise. An external sound card helped, now there is complete silence. I can’t say about a separate internal one, because. There is a connector, but there is no free space.

Answer 4

And I have a high-frequency barely audible squeak right from the system unit when you move the mouse. Maybe someone knows what the problem is?