HP laptop crashed?

I have an HP Laptop 250 G5 with the serial number CND6377Z4M. It has crashed again and again since recently, but could then be switched on again. But now he does not turn on and before that there was a short loading screen each time, which showed me that the laptop was locked. But before that, it never affected the start-up process again, so I didn't worry. Is there possibly the possibility of a key combination to unlock the laptop manually, if "only" that should be the problem?

Hp has a very good technical service reputation

you can of course also first read the FAQ if your problem is mentioned there