My AVH 4200NEX has worked fine. There is a backup camera installed. This morning I went out and started the pickup and the image that appeared was the rear view with guidelines. I could not get rid of the video. I turned the key off and then back on, and now I get a blank screen - no Pioneer logo or disclaimer, and then the screen goes black and the rear guidelines show up. I can't get to the main menu, or ANY menu. The radio just sits there with the black screen and guidelines.