How do you turn display back on?

Hi,
I use a large Dell 24" external monitor with my Macbook. I can't find where to search for the way to turn the computer screen back on. Could someone tell me how to turn my Mac book display back on?
Thanks much!

Under displays Preferences you can click the box that
says "show displays in menu bar".
This gives you an easy way to do this. Once you
reopen your MacBook just click on this display icon
and detect displays. This will allow the MacBook
monitor to come back awake.
You can also do it from the displays preferences
window I just find this way easier.
Mort
Hi,
Thanks. Couldn't quite figure out how to do this. Could you give a little more detail? Thanks. Dan

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