I just got a Series 2 DT and I hooked it up using my Comcast Digital box and it works great. The one thing I don't understand is why my cable box is not working. I tried acessing the On Demand feature using the cable remote and got nothing. Then I tried turning the channel with the cable remote and nothing happened on the TV. Even when I turned the cable box off, both tuners still worked with TiVo. My cable is split, 1 to TiVo and 1 to cable box, then from TiVo to TV. From cable box to TiVo using RCA jacks. Any ideas?