Hi, try a "disc cleaner" inserted into unit, its possible the laser reader is dirty - run it a few times then put nav disc back in and try again AND/OR
1/ run the engine and don`t turn off !
2/ insert nav disc
3/ press MENU + ZOOM (down arrow) together and hold for a few seconds till you get "disc error" on diplay
4/ on screen display select SYSTEM LINK
5/ select NEXT (opens CAR STATUS page)
6/ press NEXT (opens YAW RATE page)
7/ press NEXT (opens DIAGNOSIS MENU page)
8/ select UNIT CHECK
9/ select FORCE DOWNLOAD
10/ screen goes blank
11/ message appears - Please Wait. Now downloading software, then "please do not switch off engine"
12/ the progress bar will appear ( Green Bar)
13/ after a while the Honda Main Navigation Screen should re-appear
14/ message appears - The System Provides Route Information .... etc
15/ press OK
16/ on completion your download will operate and map, you may have to drive your car around for a short while, this allows the unit to "pick up" signal.
That`s it - if this does not work, the laser unit (eye) could be faulty ! This worked on my car and occasionally I have to re-run the above (I think condensation can cause this also)
I know it sounds a little long winded but like I said, it worked on my car - I also bought a version 2011 update disc, that is the latest disc that Honda made.
Hope this helps, let me know how you go on.