sikoriko, it was out of warranty last year, not a big deal. Anyway, I connected the factory cable directly to the incoming cable eliminating the box thinking perhaps it is the box but it still does not work. Again I hooked up a new cable from tv to the incoming cable bypassing the box and it works fine. I put in a splitter and connected the box again so the other tv sets are connected and the other 2 sets work fine.
Somewhere the factory installed cable to the main tv is broken and not working so I guess I will just work with the after market cable I just installed. Thanks for the replies.