1. Does the map CD from your former nav drive work (the DVD based MkIV works with both CD's and DVD's)? If so then you may have a bad DVD disk

2. You may have the wrong DVD disk for your drive. There are two different versions. One is for the i-bus MkIV's such as you will find in the X5 and the other is a MOST-bus MkIV such as what you will find in the new style 5 and 7 series. They are not interchangable.

3. You may have gotten a MkIV for a MOST-bus vehicle, which won't work in an i-bus vehicle like the X5.

4. You may have gotten a defective MkIV

5. You may not have the connections made properly (unlikely, but possible)

If it won't take disks at all then it sounds like a bad MkIV to me.

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