Clarion CZ109 Car CD Player "amp grd error" Questions

...AMP GRD" across screen... caint figure out what this means..... in need of help Im guessing you have an amplifier if not check the cd player ground " AMP GRD" means amp ground is faulty. In the event ...

...amp grd" ,the code only shows up when you go to turn up the volume other than that it seems like it is working but without the sound? check your wiring for shorts or nicks, you may have a bad speaker ...

...AMP GRD" is displayed. I turned down the volume and cut the power for 5 minutes, but the display will,not go away. I live in Canada and received this off E-Bay a month ago, but really don't want to ...