Occasionally you may encounter a problem with you Apple TV and need to restart it. There’s a few ways you can restart your 2nd and 3rd generation Apple TV.
If your Apple TV’s software is version 5.0 or later, you can restart it using the onscreen menu.
To restart your Apple TV using the on screen menu go to Settings > General > Restart.
You can also restart your 2nd or 3rd generation Apple TV by using the remote.
To restart it using the remote, press and hold Menu and Down (buttons 3 and 4 in the photo below) on your Apple Remote for six seconds and then release when you see the LED light on your Apple TV flash rapidly.
Of course, if all else fails you can unplug the power cord for thirty seconds.