1989 560SEL radio anti-theft mode
 

hello everyone, I hope that someone here can help me out, I just bought a 1989 560SEL I drove the car home 85 plus miles and all was ok, I had the radio on the whole trip home, now some of you guys know that when you get a new toy ya just got to play with them and thats what I did, stupid me, anyway, I wanted to see if the one key I had would work in all the locks so I got out and lock the doors and all is ok, well, when I get back in the car, the radio would not come on, all I get are spaced lines on the display when I push the power button, what did I do, is this radio toast, I called the MB dealer and gave him my vin and the radio serial number and he was able to give me the code, but the radio will not do anything, nothing at all no matter what buttons I push or for how long I hold them, what do I need to do or how do you put the code in. Thanks