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I'm having the same problem.

I have cable that works with the old TIVO and it also has an HD stream which I can see on the TV.

When I plug in the HD Tivo to the coax cable, I occasionally get video, but usually I get nothing but a grey screen and the Tivo-generated "Searching for Signal" box.

I'm wondering if my cable system is using the new SDV Format which apparently borks Tivos.

FWIW, I'm in Phenix City, Alabama and I'm using Cable TV of East Alabama, whose customer service is in the bottom 5% of cable companies.

The Forum won't let me insert the links for SDV Format but google for SDV cable and you'll find some info on it.
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