How do I turn MacBook Pro's screen back on after accidentally turning it off?
How to reactivate screen
[Re-Titled by Moderator]
Original Title: Accidentally turned off screen
MacBook Pro 15″, macOS 12.7
Press and hold the power button for more than ten seconds to force a shutdown. Then restart the computer again normally.
If you simply turned the brightness all the way down, then pressing F2 a few times should brighten it up again.