Laptop starts normally, but black screen?

My laptop starts normally (Windows 10), but the lock screen appears briefly and disappears. Can someone help me?

If you light up the display with a flashlight, you can still see contours and you have a problem with the backlight. What happens when you start in the bios?

The bios starts normally.

Then I think there are problems with Win 10. Maybe the laptop can't display the set resolution of Win 10.

So what should I do?

Do you have a medium to boot into safe mode?

I should have.

Then start with it and check the graphics drivers or change the settings.

OK.