It happened to me once that the laptop got stuck in a game and turning it on doesn't do anything. What do you have to do? Are there certain buttons?
Alt F4 or Ctrl Alt and remove (all at the same time)
Disconnect the power cable and battery if this is possible with this laptop.
Then wait 30 seconds, insert the battery, connect the power cable, start.
Press control Alt remove at the same time. Then go to Task Manager and exit the task from the game. That's how I always do it.
Hold down the Power button for more than 4 seconds.