To start, I'm guessing you have an '07 or '08 model judging by your join date. Perhaps it's a bad dvd drive. If it were just a blank or VERY dark screen but it still works (you can see with a flashlight) like my problem was, then you can just get the screen replaced. Search the forum for bad drive and see if the symptoms are the same.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr