The monitor does not see the computer, what should I do?

Question

Iron

Hello.
I connected the system unit to the new monitor using an HDMI cable.
Turned on the system unit, turned on the HDMI connection in the monitor.
Nothing happens. Writes that there is no signal.
I rebooted several times, waited and firmly inserted the cords. What to do?

Answer 1

In the operating system, it would be good to set the output to the correct output, especially if before that the monitor was connected via VGA.

Answer 2

If there are other HDMI connectors on the system unit, you need to try them.
Is the system unit correct?
Is there a characteristic beep when you turn it on?

Answer 3

in the monitor it is possible to manually need to manually select the channel