Try to keep pressing power button for a couple of minutes, litterally. It might work! Good luck.

Well, I don’t know if this is the case, but I found some solutions online, tried each and none worked. Ended up opening laptop and… BINGO! Power button cable was disconnected from board! :D As simple as that. So in my case, it was very simple to solve. Just closed it again and that’s it, it’s working without problems so far. Hope this is the solution for your case! If not, try the different “reset” methods that exist online.