I have no picture on a couple of high def. channels but I have sound on only 3 of the cable boxes in my house. The fourth cable box is fine.
Hey there shawaccount
Chances are that the 3 cable boxes in question are older models and do not support MPEG-4. A number of newer channels use MPEG-4 compression for video, and require a cable box that can handle that to display them.
There's more info and details here: Guide to MPEG4 Channels and Digital Cable Boxes
I hope that helps! Let me know if you'd like to discuss any further.
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