Xbox One controller not turning on and connecting to PC

My Xbox One controller has suddenly stopped working, it does not turn on. The only thing it does do is when I hold the Xbox button, it will flash for a short amount of time but nothing else.

I've tried changing the batteries a few times but it hasn't made a difference, I was originally using a rechargeable battery pack from amazon.

I have also tried using a wired connection to my PC with no batteries but it still does not turn on.

I only use my controller on PC with a Bluetooth adapter, no console.

:)