Windows laptop greyscreen?

Moin, my laptop was probably even less interested in the online lecture than I did today. I started it up and now when I want to log in, the laptop is greyscreen. I can only see and move the mouse. I have no way of restarting it, as the power button only puts it into energy-saving mode.

I'm currently trying to let his battery run empty so that it somehow dies.

I'm very grateful for any help mfg

Hold the power button for 30 seconds!

It worked.