My TIVO HD unit and Comcast cable cards set up without a problem. Since I've had the TIVO, I've been using cable card 1. Today, for no reason, I decided to switch to card 2. I hit Live TV button, the banner for the channel the card was tuned to came up, but the screen was grey. When I hit Select, the channel came on and all my channels appear to be there. I switched back to card 1 and the same thing happened, grey screen with a banner and after Select, the channel comes up. I just got concerned about the grey screen because from several threads I've read here that seems to be something that happens when things aren't working right.