"Mode not supported" freezes AppleTV Gen3 on Samsung 61in DLP.  AppleTV is ok when moved to another TV... Help me get it back online with the Samsung?

I just hooked up the AppleTV Gen3, and it worked great on my 61in Samsung DLP TV that should do 1080i.  When I looked at the resolution settings in the AppleTV menu, it said 720i.  I tried to change the resolution in the settings menu, and it came back with a message "mode not supported..."  I was able to initially get back to the menu and choose what I thought was a supported resolution (1080i), and it again displayed the same message, this time freezing the AppleTV.  I could no longer communicate with the AppleTV device although the remote was working fine. 
I tried most solutions that I read on the support forums.  So far nothing has worked ie changing HDMI inputs, removing power, etc.  I moved the AppleTV to another Samsung TV, and it worked fine - and I was able to adjust the resolution.  When I returned to the orignal Samsung it again displayed the "mode not supported" menu and it remains frozen.  Any solution?  Will a reset back to factory settings help - or am I stuck?  Frustrated.  Help?

Same thing happened to me with my peruvian credit card in the peruvian app store, I want to buy an app, but it says that my credit card is "not supported in the Peruvian app store"

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