Hi, I just got a new Apple TV 4 but after connecting it and switching to the HDMI source on my TV I only see a black screen, and there is no signal coming from the HDMI. When disconnecting and reconnecting the Apple TV from power, I see the Apple logo shortly (less than a second) and then the signal stops. The white LED blinks when I click on the remote buttons. Restarting the Apple TV by pressing Menu + Home for 5 seconds results in the same outcome. Anything I can do to diagnose or even better fix this on my own?