I plugged my apple tv into a different tv, which I have done multiple times. However, when I replugged it into the tv in my room, it just says no signal. I tried unplugging everything, tried to reset it, turn off the tv, etc. Nothing seems to work.
It could be your cable, check the HDMI cable with another device and also check the TV port too, they can damage or use another cable with the apple TV if you have one.
If that is not the issue post again.
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