Laptop is frozen - what to do?

Since yesterday my laptop has frozen and there's a white line in the top left corner, I can only move the mouse and nothing more (so any keyboard shortcuts from the Internet do not work either). Can someone help me with that?

Just switch off your laptop?

Shut down and start up again.

Take it off the power for a few minutes

It is best to turn it off, take the battery out and then turn it on again. Then the laptop should work again.

I've already tried it, but it doesn't work.

Is the laptop warm?

No, it's rather cool or like always.

Press the key combination Ctrl, Alt and Del

Thanks, everything is fine now.

Press the key combination Ctrl, Alt and Del.

Thanks for the star! ⭐️