"No Signal" or a black screen from an Apple TV is almost always a HDMI handshake, a video format the TV can't accept, or a cable — not dead hardware. The Apple TV negotiates resolution/HDR with your TV at power-on, and if any piece can't carry it, you get black. Two fixes clear the large majority of cases.
Fix it
- Force-restart the Apple TV. On the Siri Remote, hold Back (or Menu) + TV button until the front light blinks, then release — reboots and re-runs the handshake. Or unplug it for 30 seconds if the remote can't reach it.
- Power-cycle in order. Unplug the Apple TV and TV for at least 30 seconds, power the TV to its home screen first, then the Apple TV.
- Reseat and swap the cable. A cable fine at 1080p fails at 4K HDR and goes black. Try a short certified Ultra High Speed cable into a known-good port.
- Turn on the TV input's enhanced mode. A 4K HDR Apple TV on a limited port shows black: Samsung Input Signal Plus, LG HDMI Deep Color, Sony Enhanced format, TCL/Hisense HDMI Enhanced.
Reset the video format (for HDR/black-after-it-worked)
If it worked then went black — often after switching to Dolby Vision/HDR — the format is the problem:
- The Apple TV auto-reverts a bad format change after 15 seconds if you don't confirm, so a change can't permanently brick it.
- If you can reach Settings: Video and Audio > Format > 4K SDR, then Match Content > Match Dynamic Range = On. Run Check HDMI Connection to verify the link.
- If it's black before you can navigate, plug the Apple TV into another TV/port to set 4K SDR, then move it back.
Isolate the fault
- Try another HDMI port — one dead input but another works means that port failed; use the good one.
- Try the Apple TV on another TV — if it works there, the original TV input/cable is at fault; if it's black there too with a known-good cable, the Apple TV may be failing.
See also
FAQ
My Apple TV shows No Signal. Force-restart it (Back/Menu + TV button), then power-cycle the TV and Apple TV in order — TV first. That clears most handshake black screens.
It went black after I changed to Dolby Vision. The format is the cause — but it auto-reverts after 15 seconds if you don't confirm. Set the format to 4K SDR and enable Match Dynamic Range.
Black only at 4K. Enable the TV input's enhanced HDMI mode and use a certified cable — 4K HDR needs both.
How do I know if the Apple TV is broken? Try it on another TV with a known-good cable and 4K SDR. If it's still black there, the unit may be failing; if it works, the original TV/cable is at fault.