How can i fix my Reddmango Angora mr888?

I cannot get an audio output on this device, nothing works Ipod, Radio or Cd's there is power to it, i can select any function Ipod etc, its reads cd's fine, knows the ipod is docked, can find radio stations but just no sound what so ever, i have a green cable that came it, and what are the ipod in out plugs at the back of the stereo for, any advice would be hugely grateful, or as long as i live i will never by anything from reddmango again, there customer services is completely shocking, thanks