seems my Acer Nitro 5 is broken. No problem since today. I turn my laptop today afternoon and it did not connect with BENQ screen.
I have checked cabel connection, change ports in screen - still nothing. I plug in it with TV - no signal.
On top of that, at the list of hardware I see no connection with BENQ screen.

Drivers have been checked.

Any ideas or it is time for maintanace at service?

What about your hdmi cable try a different one.

Is it possible you did a bunch of windows updates recently or did a BIOS update?
Recommend to Update Bios possibly with the Acer Software.

Next I would try Turning your " Power Options " to maximum and restart, and see if that helps the situation.

If not, then try right clicking the desktop > click display Properties, as shown in the picture, and click identify / detect then click identify and detect again.

If that doesn't work, then Yeah I would look into a new HDMI cable , and possibly a weak HDMI port.