New E70 owner

[Keithd]

Hi all I have recently purchased 2008 X5 3.0D and am slowly working my way through its operations
The only issue to date is the nav system it will not recognise the cd. I have checked that it is not damaged and is the latest version but get the error message insert cd
Any suggestions as to known issues before I take it to the dealer to diagnose fault and apply for a second mortgage on the house boat and anything else I own.
How do I find out what features are installed in my car I find the the manual is next to useless unless you know what is installed etc.
No doubt I will have more questions as I venture on the BMW journey. I am very impressed with how the car handles and performs my previous ride was /is until sold 2004 Landrover Discovery 2 TD5 great car and very capable but I do not use its 4wd capabilities so have upped the anti in luxury with out forgoing ability to take me where I want to go
.
Looking forward to learning for the brains trust on this site
I am located in a small country town in NSW Australia with a lot of dirt roads to negotiate.
cheers Keith