MK4 No Display?
 

Recently went for a ride in my X5 when I noticed the display turned black while driving. I had it set on AUX input, that still works whenever i connect my phone for music, the button backlights turn on and sound is fine, the rear Nav DVD unit doesn't show a red light near the eject button. I've checked for continuity in the fuses and they seem fine. any ideas?

bump!

it sounds like your nav unit (the Mk4) has died. See if you can locate someone near you that has a unit that you can swap between vehicles as a good way to narrow down the source of the problem.

just turns out I blew fuse #75, which is a 5A fuse. guess i passed it when i tested them all with the multimeter, lol.