Hello there, haobonj.
When having issues with your Apple TV, the following Knowledge Base article offers up some great, in-depth steps for working through most issues:
Apple TV: Basic troubleshooting - Apple Support
- Make sure the cables between your Apple TV, AV receiver (if used), and TV are connected properly.
- Securely connect the power cords for your Apple TV, AV receiver (if used), and TV to a working power source.
- Turn on your TV and switch it to the correct input on your AV receiver or television.
- Restart your Apple TV, your television, and AV receiver.
If the issue persists, see the steps related to your issue below.
Thanks for reaching out to Apple Support Communities.
Kind Regards,
Pedro.