I first would recommend restarting the Apple TV, as I dont see that as having been done just yet.
Apple TV (2nd and 3rd generation): How to restart your Apple TV
If that does not resolve the issue, it may be a good idea to restore the Apple TV with iTunes. Note you will have to setup the Apple TV again, and sign back into any services you subscribe to.
Apple TV (2nd and 3rd generation): Restoring your Apple TV
All the best,