I was on the phone with Comcast for an hour, attempting to get my CableCARD's to work in the Series3 Tivo. Initially we kept getting a error code 161-1 and 161-4 over and over again. Then we just got 'CableCARD 1 is not in normal operation', and 'CableCARD 2 is not in normal operation'. We gave up and they are sending a technician, and STRONGLY recommending I get in contact with Tivo over this matter because Tivo's software isn't allowing them to see what's going on. I just rebooted Tivo and it's back to the error code messages..... ...sigh, this hasn't been fun.