Who is very smart?

I have a problem: I started my laptop and only the start screen is displayed. (Not even the date or the time)

I restarted it and now all I see is a black screen

Go to the workshop or the shop where you bought the ^^

Proposed solution

Start up the computer and wait until the screen goes black.
Now press the space bar or Ctrl. Windows switches to the login screen, which you can't see because the laptop screen remains black.
Blindly type in the Windows password and confirm with Enter.
Windows should now show the desktop. Start the https://www.nicepriceit.de/ratgeber/windows-update-funktioniert-nicht and install the latest graphics card driver.

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