Unpacked and setup my old Beocenter 2 earlier today, it's connected through a powerlink to a Penta Mk2 speaker, which is connected to another Penta speaker through powerlink. But for some reason there isn't sound when play CD's any more. I have tried several different cds. It reads the cd, and counts number of songs, even starts show much of the cd it have played. But no sound comes out of the speakers.  Works fine with my turntable or other aux line in devices. Any idea what could be wrong?