My multi-media screen, including the navigation and Sync control screen, is completely blank. The power button isn't working. I can't listen to the radio, use the navigation, or anything sync related. I can't even see videos from the Reverse camera. I troubleshoot it with Ford customer service and no luck. I reset it by unplugging the battery, no luck. I took it to the dealership and they want $850 to replace the entire radio because my car is beyond the 36K miles warranty, though the car is only 2 years old.