I have the exact same problem!!! It worked totally fine this morning and then after work, I start my 2008 Jeep Commander and the radio is dead, black screen, can't tell if the button is on or off, no navigaton, no back up camera, nothing! Came home to google and thought it was interesting that I found your post - same model - same problem - 3 days ago. I found other similiar posts out there too on different sites. My commander is fully loaded as well and only has 22,000 miles on it. I haven't had any problems with it until now. I'm calling the dealer as I have an extended warranty, but how bizarre??!!