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Interesting problem, perhaps you might try to do a reset of the system initially. Normally, this ought to revert everything back to factory default but of course all user settings, preferences and configurations would also be erased. Additionally, some models/units would also ask for an entry code before being operational, pls have this available if your unit requires one. An alternative method of reset is to remove power from the mains. But again, as a reset and a code might be required.
Could you possibly provide likewise the exact make and model of the Nav DVD-CD?
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.