Stuck on the second parameter to display on a laptop with only 1 screen

My son clicked on 2nd screen only on his laptop and the screen became black we can't he come back to normal.  The screen remains black even after stop and turn it back on.  Is there a control function that I can use to go back to the 1st screen?

OK, I fixed it.  I had to get another monitor out of my old desktop computer and plug it into the laptop.  Then I could see on the screen, we pressed cont + alt + F4, a screen side popped up which had the possibility to the pc screen, the second screen and 2 other screen options.  I just clicked on the pc screen and everything went back to normal.  I don't know how I would have fixed with on the second monitor well.

Tags: Windows

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