Acer G5-793-72AU HDMI problem

The HDMI doesn't work. I have a monitor linked with hdmi, which, for a while started flickering. I though that the monitor has problems. Now the monitor doesn't work anymore so I guessed it is dead. But I tried to link the TV and it doesn't work either.
The thing is if the monitor is connected and I'm starting an app which was previously opened on monitor it opens it again on monitor (the monitor is not working, I just know the window app is there); if I unplug the hdmi cable then the app appears on predator display.
So, hdmi is not working but if I unplug it the pc knows.
Can someone tell me if I can do something to fix it?

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calinc

Is there something related with updating to the last BIOS version?

calinc

As I discovered, using the mouse, the laptop display is 1 and is extended with the monitor identified by 2. It is working but the monitor doesn't show anything. In settings I see that the monitor is recognized by the laptop but no image. The same for the TV.
Is there someone who could help me with this?

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