Like any device, from time to time an Apple TV can give you problems. In most cases a restart, reset all settings, or restore to factory settings will fix the problem. If you're Apple TV is totally non-responsive — or bricked — the only way to fix it is a full restore using iTunes. Here's how!
Note: In order to restore your Apple TV in iTunes you'll need to pick up a micro-USB cable. They're sold separately, but if you have a Bluetooth device or battery case/pack you might already have one handy.
That's all there is to it. You can now re-connect your Apple TV to your television and verify that it corrected the problem. If you've got a third generation Apple TV or higher, you can use the tap-to-setup Bluetooth LE option for even faster setup.
If you need any additional help or have specific questions check out our Apple TV Forum!