My laptop's keyboard is not working. It's not wireless magic keyboard, it's laptop's keyboard.

My laptop's keyboard is not working. It's not wireless magic keyboard, it's laptop's keyboard. When I'm using magic keyboard, it's working. I don't understand why this is happened because I didn't drop anything to my keyboard or nothing happened to break down. I can see my keyboard from keyboards selection but I can't connect to it when I click on it.