Laptop keeps turning off, what to do?

I've had an HP laptop for several years and it keeps going off by itself when I stop a video after 5 seconds… This problem only occurred today and I don't know how to prevent it. When I did When I restarted my laptop, I was shown that he had battery problems that he never had before. It also works by itself with a charging cable…

Maybe someone knows about the problem and can please help me?

Sounds a lot like problems with the power supply. Can you remove the battery? If so, do that and then test if the problem persists