Apple TV
My Apple TV has power but the tv is black screen. I have replaced the HDMI cable and that has not helped.
Apple TV 4K, tvOS 15
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have you used the tvs remote control to set the hdmi port of the tv that the appletv is connected to as active input source?
if you have and it was me then
I would test the appletv box with another tv to verify if it was broken or not