Mysterious monitor flickering, what's the problem?

Question

Iron

Took it in for diagnostics and they said it was working. But as I understand it, they did not even disassemble it. Changed the cable, it's not in them. The mystery is that it flickers mainly on the desktop, if you remove the icons, it practically does not flicker, occasionally a little, sometimes. In the browser and other programs, it also almost does not flicker. The second monitor is treated with it everything is ok. The nature of the flicker was recorded on video. I brought everything ok from the diagnostics, as soon as I fell into a dream, I woke up and it started. Here is the video https://ru.files.fm/u/wd2557uu#/ you can watch online.

Answer 1

Try grounding. It helped.