My Mac screen is black, what’s wrong?

Start by making sure the Mac is shut down. Press and hold the power button for 10-15 seconds.

Then, press the power button to restart the Mac again normally.

Also, please see this > If your Mac doesn't turn on - Apple Support

Is it running do you think?

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.

Good idea, that is likely what it'll take to find out what iy is.