What causes signal loss on the monitor?

Question

Iron

Hello, sometimes, very rarely, but still one bad thing happens to my PC, when you turn it on, the system unit itself works, but it says "No signal" on the monitor and goes out. This happens about once or twice a month, it helps to completely turn off the system unit through the button on the PSU, after 5 seconds I turn it on, start it, the problem disappears, everything works fine, what could it be connected with?

Answer 1

Crazy option: static accumulates on the system unit. When you press the toggle switch, you touch the system unit with your hand and remove it.

Answer 2

If the reset does not help, then most likely the video card freezes.

Answer 3

First you need to identify the culprit.
Is the system unit working properly with another monitor?
Is the monitor on the other system unit working properly?
You can also try to pull out the video card and try to run it on the built-in video.
And as always, not a plum about the configuration of iron.
My old monitor after 9 years started to turn on normally from the tenth time due to problems in the monitor itself. Cured by buying a new monitor.
The new monitor did not work well on DP. The problem was in the firmware glitch of the card itself. Fixed with a firmware update.