Here are two helpful techniques for dealing with a misbehaving Apple Tv 2.
Reset the Apple TV
Your Apple TV may stop responding and require a reset. To do that, press and hold the Menu and Down buttons on the remote control for six seconds, releasing the buttons when you see the LED light on the Apple TV for 30 seconds.
Restore your Apple TV
If a reset fails to get the Apple TV back on track, you may need to restore the device to its factory settings. Navigate to Settings > General > Reset on the Apple TV. From here, click Restore.
However, if your Apple TV isn’t responding to any input or you have a blank screen, you won’t be able to access the Restore button. In this case, disconnect the Apple TV from its power cord and connect the device to your Mac via USB.
The Apple TV will appear in the Devices section of iTunes. From here, you can select either to update the Apple TV software or restore the device to its original settings.