Now i have taken all apart, the cd changer, dvd / navigator and the head unit. I have checked all cables and nothing wrong. I also have done this step: 1) Insert key but do not turn on ignition
(2) Turn on headlights (don't ask but it works!)
(3) Disconnect battery
(4) Remove fuses no. 7 and no. 41 from holder in glovebox
(5) Wait 5 minutes
(6) Reconnect battery & plug fuses back in

Now when i have done all this the display is all black, the orange lamp shines but the display is black!

So what the F**K is this?