Why does my TV screen say "no signal!"?

Hello! I've been enjoying apple TV for months now and for some reason this morning it stopped working. I unplugged and restarted the black box, (the solid white llight is on making me think the apple tv box is not the problem). I made sure everything is plugged in (just as it was) in the right places. Not sure what the deal is. Help!
Thanks

That worked! I also just went back and forth between "modes" on the TV, so maybe that did something. ha
Thanks SOOOO much!

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