We just got the Hopper, Joey in our den. We have a Sony DVD player and a Vizio TV. When playing a disc, the video is fine,

Solution
If it is not connected to the TV via HDMI check the audio cables that connect the DVD to the TV. May be disconnected or plugged into the wrong jacks.
If it is connected via HDMI (which does audio and video) then check the menu of the DVD player to see if something is set incorrectly. If it was unplugged from AC during the install it may have reverted to a different setting.
If it is not connected to the TV via HDMI check the audio cables that connect the DVD to the TV. May be disconnected or plugged into the wrong jacks.
If it is connected via HDMI (which does audio and video) then check the menu of the DVD player to see if something is set incorrectly. If it was unplugged from AC during the install it may have reverted to a different setting.
 
Solution