Alright Lads, my friend has brought a new system (dc-ts3900) so i went round to sort it out for him but for some reason i carnt get the sound to come through! dvd,video,radion and tv are all workin fine but no sound! also there is a continuos buzzin sound comin from the speakers so i disconected everythin apart from the speakers but there is still a buzzin sound! I know how to set it up as i own a Yamaha dsp-a1092 amp and accesories but i just dont get it? any ideas?