I will check my CD as it is a brand new nav unit (old stock) never been used. Thanks for the info on the video module as mine has the tv option. I am wondering if there is a problem in the chain of modules (cd changer, nav unit, radio, radio amp, bluetooth, etc.) which might cause the restart. ie I thought they were meant to all boot up in some sequence. I have a new radio module (updated by a chap in the UK) and working radio amp.

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2005 X5 4.4i M Sport
2003 X5 4.4i