I use apple tv in every hotel I go. Here's the solution. 1-Unplug the look alike phone wire.
2- Take a pin or pen, if you look behind the TV you'll see 2 small holes it will be written "reset" and "update" take your pin or pen press inside the one that says "reset" your tv will shutoff. Use the side buttons to turn on and input to change for HDMI, it will work.
3-Call the Internet provider that the hotel uses. You can check in your room for the hotel humanities, check under internet sometime it's written or call front desk and ask them. To hook your Apple tv they will ask for your ip, go on settings, about and give them the ip address. You'll good to go. Your welcome