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There can be a number of reasons for this but you can get a clue by looking at the CD symbol and Sat Dish symbol on the screen.
If the Sat Dish symbol is green the system is receiving a suitable signal and its not related to the aerial. If it is Sat Dish symbol is red it is not receiving a signal and the problem is unlikely to be related to the CD. A damaged antenna connection is the most likely problem as they are fragile. If the CD symbol stays red it might be related to either the disk or the CD drive however it can take a couple of minutes the system to settle down. Try a computer CD cleaning disk to clean the drive to eliminate the possiblity of dirt on the drive head particularly if your or the previous owner was a smoker.
Renault publish a service manual for the SATNav system called "technical note 3729a" which includes a check list for fault finding. Type this description in Google (including the quote marks) and see what comes up.
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