Yesterday my computer suddenly got a black screen while the fans where still making sounds. I turned it off but it didn't go on again when I tried. I looked up what i should do and one of the things I could do was a power drain. So I unplugged the battery, but now when i plug the battery in again there is a component that starts burning. The component that starts burning is PU401. It's a Lenovo L340-15IRH. Anyone knows what I can do to prevent it from burning and make my computer work again?