Must be the battery then, i had draind battery the other day, cant remeber if i got the sound, but the car was dead.
I had issues with instruments after i recharged the battery, but that is easy fix, just remove ground wire from battery for 15 min or so that will reset the car and instruments and al wil be fine

If it is not battery then it must be jamed or broken starter

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005