This is very strange, but it sounds like a radio problem. Do you still have your old radio that you could plug back in? If the old radio works and the new radio does not work, then I would suspect the new radio. Other than setting the radio to USA mode, there is nothing special to do to get Sirius working.

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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