I'm having the same problem w/ my N1. After getting it back from Pioneer to change the flex cable and getting it reinstalled, I can't use my nav discs also. I called Pioneer again this morning and all they told me was that they didn't touch the N1 as far as upgrading it and they only replaced the flex cable. After arguing w/ the service rep for several minutes telling them that everything was working fine w/ the unit before the flex cable went out and then being returned after the flex cable upgrade, and subsequently finding out that my nav discs aren't working on my N1, I asked the service rep if they will repair my N1 for free, and she said that she will write up an order # and the higher ups will decide what to do from there and that another service rep will be calling me w/in 3-5 business days. The price to fix it from what she told me would be $200 which is effin' ridiculous. I swear, Pioneer's customer service sucks balls.