If just running HDMI cable try adding audio cables too, check all your volume and mute settings in the system setup.
If you have audio on most channels, but have silence on some or all of your local network channels, you may have the Secondary Audio Programming (SAP) turned ON. Complete the following steps to turn off SAP.
If...
Then...
Disable SAPdisplays
Press the Select button.
Choose SAP Languagedisplays
Use the left or right arrow buttons to choose the English setting and press Select.
PREFERENCESdisplays
Scroll to the Language option, select Audio, then select the option labeled Primary or the one labeled English.
If the above quick fix doesn't work, there may be a problem with MTS, Stereo, or another SAP issue. Try the following:
Result: The Settings screen displays.
If the light is not on, try the following:
http://www.cox.com/residential/support/tv/article.cox?articleId=81da8760-5c47-11df-ed4d-000000000000
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