My Panasonic Viera TC-L42U25 is not connecting to a tv box over hdmi??

Gamelover

New member
I can see a picture on the TV and it works fine over the PlayStation (hdmi), yet for some reason I cant get it to work over a cable box which is supposed to connect over hdmi. I have tried the signal receiver on other tv's and it works fine. I don't know what to do i have tried different hdmi wires and nothing works. I have also tried all 3 hdmi outputs and absolutely nothing works.
 
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