I have a a couple of Apple Tv's all of a sudden on one TV I had a message that my HDMI cable need to be connected and was not recognizing the Apple TV.
I bought a new cable, started to work and now doesn't again.
Changed HDMI port same again works for a short period of time then TV goes blank, thought the Apple TV maybe having issues so swapped with another same thing again but did work on other TV.
Have tried using a PS3 in HDMI port works fine
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Appears to be a TV issue, try turning it off and on again.
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