Well after much work and frustration, I finally was able to get a Tivo HD to work properly. The first TiVo HD unit I had kept reseting itself, along with cablecard and basic cable issues. I returned this unit on Saturday and received a new one. The cable card had already been activated from when I attempted to install it on the previous box, and worked on the newer one. What is most surprisingly is that the cable card, an M-card, was actually activated correctly by Comcast 
. Everything ran smoothly and to this day (cross-fingers), I have had 0 problems with the new box. The HD Channels look amazing, not much pixelation as some people on here have experienced. Not to mention, I was not required to upgrade to digital cable package to get a cable card, and all but three or four of the HD channels are offered in the standard package. So, my faith and trust in TiVo is restored. Hopefully you guys that are experiencing problems will be able to get yours fixed as well. Good luck
. Everything ran smoothly and to this day (cross-fingers), I have had 0 problems with the new box. The HD Channels look amazing, not much pixelation as some people on here have experienced. Not to mention, I was not required to upgrade to digital cable package to get a cable card, and all but three or four of the HD channels are offered in the standard package. So, my faith and trust in TiVo is restored. Hopefully you guys that are experiencing problems will be able to get yours fixed as well. Good luck 
