Apple Tv will only work on 1 TV - How do I get it to work on an alternative TV

My Apple TV works perfectly on one of my Televisions.  But when I unplug it and move it to a different room with a different Television it won't connect.  Apple Tv White Light is on; iMac can see Apple Tv is on, Wireless Network is Available, Correct Input is selected on the TV -  but all I get on the TV is a black screen, not even the apple logo.  When I move it back to the original TV it works perfectly again. 

Seems likely that the other TV doesn't support the currently selected video resolution.
Either got to Settings for Audio and Video and choose Video Resolution of Auto (if it already has that, then skip this!), or try this:
Change the Apple TV resolution:
Press and hold the Menu and Up button on your Apple Remote for six seconds.
The Apple TV will automatically cycle to the next resolution at approximately 20 second intervals.
Press Play on the Apple Remote to keep the current resolution or Select to manually cycle to the next resolution.
from:
Apple TV (2nd and 3rd generation): Troubleshooting video issues - Apple Support
If you have a black screen because AppleTV can't connect with the current setting the method above will cycle screen resolutions so when it finds a compatible one you can select it.
Try a different HDMI lead and or input on the other TV if still having issues.

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