No signal
Haven’t used my Apple TV for a while and it tells me there’s no signal.
Apple TV
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What is your model Apple TV? Identify your Apple TV model - Apple Support
“No signal” sounds like a message from the TV that it isn’t detecting a signal from an input (e.g. Apple TV).
Verify that the status light on the Apple TV is on and shining continuously.
Verify the HDMI connection, that the plugs are seated firmly in the ports.