Arris IPC4100 - No audio when viewing cable channels; No audio from center;surround speakers

Chapter 11:
STANDARD 365-095-33577 Revision x.1 IPC4100 Release 1.0 Installation and Operation Guide
85
There is no audio when
viewing cable channels.
 Verify that the mute button on the remote
control has not been pressed. Press MUTE on the
remote control to restore sound.
 If the VMS audio output is connected to the TV,
verify that the mute button on the TV has not
been pressed.
 If the VMS audio output is connected to a home
theater receiver, verify that the receiver is set to
the appropriate input source and the mute button
on the receiver has not been pressed.
 Verify that you have the correct cables for the
audio connections.
 Verify that the audio cables are firmly connected
between the VMS and the audio playback device
(TV, receiver, DVD player, etc.).
There is no audio from the
center and/or surround
speakers of a home
theater receiver
connected to the VMS.
 Not all Dolby Digital programs feature full 5.1
surround sound. In some cases, the programs may
only contain left and right stereo audio.
 Verify that the S/PDIF cable (coaxial or optical) is
firmly connected to the VMS and the home
theater receiver.
 Verify that the home theater receiver is set to a
surround sound audio mode (Dolby Digital, Dolby
Pro Logic II, Dolby Pro Logic).
 Verify that the receiver is properly configured to
work with all connected speakers.