I hate to post something like this, but after looking through the problems I don't see anything quite like mine that has been resolved. Here's the deal:

My n2 unit will play dvd vid, cd, etc, everything works except for the nav discs. When I insert one it says "checking disk" and just stays like that. The unit does recognize when a different map is inserted (ie east west) because it will reboot. However, the maps never load. What could be wrong here? There is a vague reference in the manual about "the program" which I assume to be the navigation program so I'm assuming that is the problem, but i don't see that a reinstall disc came with the unit. HELP!

When I left the dealer - my avic nav was working . I think I may have accidently erased the application program?

Ideas?

Are you sure the navigation discs aren't badly scratched? If you aren't using the N3 software, trying loading that onto the unit and see if it functions properly from there...

yeah the discs are brand new out of the package, and i tried loading an n3 disc (burned from a dl) without luck - it reads dvd without any problem though which doesnt make any sense!

Does it even attempt to read the new N3 software when you load it? What exactly does the unit display when you insert the discs?

It reboots.. then says checking disc.. after about a half hour it says "and i quote" : "Dvd has some problem"

That's strange... Sounds like there's either a problem with your discs or there's a problem with the lens inside your deck. If you're using a downloaded copy of the N3 software, I've heard that there is a bad copy going around. I've been told that the way you can tell that it's the bad copy is when it begins to load, it says 1/1 instead of 1/2... If you've got original copies of the discs and they're not scratched, it must be your lens. Try using a lens cleaner. If that doesn't work, perhaps your lens is damaged and your unit may need to be sent in for repair.