I'm missing at least 40 channels which are a mix of basic and premium, HD and SD Setup 2 motorola cable cards w/ Comcast service I've been on the phone with Comcast 3 or 4 times and had a tech to my house 3 times replacing cards and attempting to fix the problem. At this point they have about given up. Most of the 40 channels are accessible but have a black screen. Some channels (like 44, CNN) aren't even able to be pulled up via the Test Channels screen. I was getting all the missing channels before via my digital box but now via cable cards and TiVo they're gone. My other cable box on another TV gets them fine. Any suggestions before I take this TiVo back to the store and revert back to my old series 2?