If it's just the cable box that's not providing audio into the receiver, you might try checking or adjusting either the audio output settings, or in some cases, resetting (unplugging momentarily) the cable box might be able to fix this issue.
Purchased the HT-C6930W about 2 months ago. Great system, and I've had no issues... until now. I have my cable box directly feeding into the home theater, as the HDMI1 input, and suddenly, I cannot get that to produce any sound. The picture works fine, but no sound. The Ipod dock, the Blu-Ray player, and the streaming Netflix and streaming Vudu apps do not have this issue. It's solely on the HDMI1 input. Any ideas???
Thanks in advance!