I have the same issue with my f900bt. Just happened all of a sudden. Unit is stock with 2.0 update only. Worked fine when I shut the car off on Friday and then the car sat all day Saturday. Started it up this morning and noticed the radio did not come on. The buttons light up for 20 seconds and then go out. I can hear the fan still running in the background. When I try to enter the service mode by holding down Reset, Menu, Map, and Eject, the lights all go out. When I release Reset, the lights start flashing but still nothing happens. The screen stays completely black. Any suggestion