ALL CHANNELS WORK. BTW - I had a Comcast Tech come out here Sunday night to fix a Comcast HD Box. All my NON-Comcast DVRs with CableCards were working fine. The TWO COMCAST HD Boxes were NOT WORKING - WHY - Signal was TWO HOT. Comcast had upped the Signal Strength in the Neighborhood. All the Tech finally did was reduced the signal strength and boxes started working AGAIN.