Screen failures at monitor?

I bought a new monitor to connect to my laptop. But now I often have screen failures

Would be glad about help

It could be due to cable or power settings. Does Windows make a confirmation sound at the failures? If the screen is off, can you still go over the edge, or is it the only screen active?

Remote diagnostics are impossible. Are the connections between monitor and laptop and the power supply firmly and securely connected?

I have already checked the cable because it is not. Windows does not sound either. Yes he is in use as a single screen and energy settings I think I have set correctly