Day 18... Have had Tivo since 2000 so I am pretty Tivo savy. Upgraded to 2 new Tivo premieres, 1 is XL4, after Tivo 3 HD froze. Since installing cable cards in the new Tivos I have been unable to get HBO on any of the channels. Called Comcast and had many technicians trouble shoot over the phone with no results. So far in the past 18 days I have made 23 phone calls, 5 tier 2 techs included, to Comcast and have had 5 different service techs in my house plus one supervisor. I have even returned the XL4 (premier elite) for a new one. Comcast finally has all channels including HBO working on the regular premier. It gets worse... 4 days ago the XL4 has all channels black with no signal. Reran guided setup and got all channels back except HBO. 2 days ago lost all digital channels. Now I only receive NBC, CBS, ABC, FOX but no "extended basic" channels. 2 techs and a supervisor latter and still nothing. Tech just left after he had Comcast completely remove me as a customer and then add me as a new customer to wipe out all rate codes and the like and still only broadcast TV. TV upstairs still gets all channels just fine. I have gone through 6 cable cards including unpairing the one that works upstairs and repairing with the XL4 and no change. They say everything on their end is checking out fine. Only thing that is different since losing "extended basic" is that under the cable card menu under conditional access the Con used to say Yes and now is says No and the Val used to say V and now it says ?. I live in the Chicagoland area. Does anyone else have cable cards that I can switch to and get rid of Comcast. Does AT&T? Anyone else have this problem and know of a solution?