Car Stereos: Moonsoon stereo, vw jetta wolfsburg, vw jetta

Question
2003 VW Jetta Wolfsburg 1.8T/55000mi.Headunit with antitheft security works ,read CD,but no sound in speakers.I check all fuzes-OK,pull out headunit,check fuze on headunit-OK.I plug all wires back.All connection fine.Cant change channels,cant change FM to AM,but when I turn volume botton OFF-beep sound come from speakers like in use too before.May its need to bee change fuze on amplifier?But I look in trank and dont see amplifier.I dont know if my car has amplifier.  What is the problem?  

Answer
If I remember correctly, the Wolfsburg edition has an external amp, but I don't recall where it is located. It's not likely that there is a local fuse on it though. I would take it to a local stereo shop and have them test..the problem with the FM to AM change leads me to think that your problem is deck related rather than amp.
Sorry I can't be much more help that that.