Just bought a used 06 civic ex coupe. The radio (stock) turns on and shows the fm station/ cd info but no sound comes out from any of the speakers. My mechanic said that the speakers are fine (they worked with another car's radio). I checked fuse #35 and it looks fine. Can anybody help me with this? I can buy another head unit from ebay but I first want to make sure that that's where the problem is.