HELP!!!!Have a Blaupunkt Kingston DJ?

....and also got the code,but when I bought the car it was only four - - - - on the display.I´v tried to cut the batterie out,but nothing happens with the stereo.Any suggestions on how to make it work as I also have tried to reset it in what ever way they are telling me in the book......

Driving me crazy,so anything would be helpful :)

Thank´s in advance
Cath