2 relatives have Zgemma boxes and there's no sound on the HD channels cable.
One box is the older H1 the other is the H2.
It was working fine up till recently and they didn't go off at the same time. I do know the sound on another relatives box elsewhere is working fine.
Is there something in the settings that needs altering ? (openATV). I have told them swap HDMI cable and try another socket but it's the same