After registering for UKtvplay on Demand I no longer have sound on the "Live" service. After contacting UKtv they said it has no effect over the Live tv part of the service and to contact YOU VIEW. Have done a reset on tv taking it back to factory settings and then auto-tuning but the problem is still there. anyone got any ideas?
Try cycling through different HDMI inputs on your TV. Otherwise, contact YouView as suggested: