Tore my hair out with this one. Chatted with a tech who was very patient etc. and finally read this forum. I found the remote that came with the TV, clicked the HDMI button and Voila! the picture returned. I don't think the fix was a real lesson for everyone. My guess is that something got tampered with and the HDMI just reset the Cable box. Thanks to the forum guy. You pointed me in a new - and correct - direction.
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