My NAV has no screen and radio will not turn on. I was able eject CD’s, but will not load them. I do not get asked for a code in the temp area. I have pulled every fuse and everything was good. I have also tried holding down 1 and 6 and then pushing the power button. The rear NAV unit disc ejects and is not scratched. I am not getting codes either! The Eviromental controls work surrounding the screen. I am at a loss, do I need a new radio? Any help is very much appreciated!