Why is my Xbox one controller not turning back on.

Controller went dead plugged in battery pack til 100% charged put back in Xbox 1 controller. Then I hit the middle button to turn on. Don't light up. And just vibrates constantly uuntil I take out battery pack. Plug in usb into controller. And it still does the same thing. Have no idea what's wrong worked fine until it went dead. Any help on what's wrong..