Hdmi on set top box dvi on tv no audio

[desperate_30]

have conected new set top box to tv no sound have red and white cables connected and Istill have no sound please help doing my head in

 

[soundguruman]

Look in the audio menu for the TV and the audio menu of the set top box.
In one of these or both of these menus, the audio settings are wrong. Check the audio input setting of the TV. Check the audio output setting for the set top box.
Use the set top box remote to check that the audio is not turned down, or muted.