I am a preview member and am in the beta for the NXOE. I was watching TV and my screen suddenly went black and my Xbox one turned off. Upon restart, the green boot screen shows up just fine and then it just goes to a black screen. It will respond to a limited number of kinect voice commands such as "xbox turn off" and "xbox on" and those show up on the screen. Because those commands show up on the screen, I know it isn't an issue with the TV or the HDMI. Also, sometimes it shows the message: "You need to install the game or app for this" I have tried the following and nothing has worked:
Hard Restart: Held the white console button for 15 seconds
Really Hard Restart: Unplugged it for 60 seconds and restarted
New HDMI Cable: Cable works just fine with laptop and TV checks out.