Ive just purchased a MK3 Land Rover Nav computer to replace the defective one in my 2001 E46 330d with Monochrome radio navigation. The seller confirmed that it was removed from a monochrome equipped vehicle. Basically its not working, there is no nav menu on screen. Computer is powering up and powering down correctly with power light flashing before going off etc. I disconnected battery before fitment so everything 'spoke' to each other on start. Does this need a different software loaded to work on my vehicle or am I fighting a lost cause here? The seller has recomended this site, so thanks in advance for any help you can give.