Antwort auf „Xbox One Controller is Flashing Slowly and Won't Work.”If you continue having issues turning on your Xbox One Wireless Controller, check out this Xbox One Wireless Controller Won't Turn On Problem Page. I had this same issue. Googled a bit and found this, since your question was the first to pop on my searcha nd was unanswered, I figured I would post what helped me. /u/chubbybator. Here is what he said to do : "Turn the xbox on, then hold the power light for 15 seconds. Then connect a controller via usb and press the home button on the controller. Once the box loads fully you should be able to disconnect the controller and everything should work normally again."