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That sounds like the screen became completely unplugged or it is totally fried.
If the buttons do not work, that is an indication that the I-Bus wire is not connected.
Since the whole thing is dark, that more likely indicates that the screen is not getting power. It is a mystery that the radio on LED would be working. I would pull the screen and verify that everything is properly connected.
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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input
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