If you’re having problems and Apple TV still doesn’t respond after restarting, try resetting Apple TV to its factory settings. When you reset Apple TV, all data is erased, including your accounts and configuration.
You can also reset your Apple TV and update its software at the same time.
If you have an Apple TV HD and a Mac with macOS Catalina or later: Disconnect the HDMI cable from Apple TV, but leave the power connected. Connect one end of a USB-C cable (sold separately) to Apple TV and the other end to your Mac computer. Open the Finder on your Mac, select Apple TV in the sidebar, then select Restore. If that doesn’t work, contact Apple TV Support.
If you have an Apple TV HD and a PC with iTunes or a Mac with macOS Mojave or earlier: Disconnect the HDMI cable from Apple TV, but leave the power connected. Connect one end of a USB-C cable (sold separately) to Apple TV and the other end to your computer. Open iTunes on your computer, select Apple TV in the Source list, then select Restore. If that doesn’t work, contact Apple TV Support.
Go to Settings on Apple TV.
Go to System > Reset, then select Reset and Update.
Selecting this option restores your Apple TV to factory settings, erases all settings and information, and updates to the latest tvOS version.