Navigon 2100 - need to open the case to replace usb port,do not want to brake the case, don't see screw holes - help

I would suggest going here and reading about your unit.
http://reviews.cnet.com/car-gps-navigation/navigon-2100/4505-3430_7-32744602.html#reviewPage1
Go through the 2 pages.
Good luck

The following web site will be able to help you out. They have several kinds. It depends which one you want. Being a Harley you probably want the chrome. Good Luck and please rate.http://www.gpscity.com/search/q=motorcycle

[PDF] NAVIGON 2100/2120 User's Guide Your NAVIGON 2100/2120 comes with the following accessories. .... With the NAVIGON 2100/2120, you can also use an external GPS antenna (not pro- ...
support.navigonusa THEIRS A SITE FOR YOU YOUR FUSE IS A 6V 1 A RADIO SHACK SHOULD HAVE ONE OR PACK OF 5 6 BUCK OR SO

When you changed your charger, did you get the right one?
I bought an iGo and thought I could use the standard min usb tip. However, tip number A53 does charge and show the map.
I hope this answers your question.

Wiring diagram pinout for Navigon GPS charge and concurrent use Pin Pin
Name Description 1 +5V 5 Volts Direct Current 2 Data floating/Not connected 3 Data floating/Not connected X Ident Conneted to Pin 4 (GND) as pure short, no resistor 4 Ground Ground, shorted to pin "X" Use of standard mini-b will place unit in Data Exchange/Synchronization mode. Use of mini-b with a 4-x pure short will allow use of Navigation software and concurrent charging. USB power source must be 1000 ma or above.

we purchased a used navigon 2100 it did not have a user manual with it and we would like to have one

The problem lies with the fact that a standard mini usb pin-out has + voltage on pin 1 and ground on pin 5. The navigon is programmed to recognize this as a computer. The navigon charger however has + voltage on pin 4 and ground on pin 5. The reason for navigon doing this as opposed to following the standard pin-out is due to the unit requiring a stronger power supply to charge the battery. USB current output on a computer does not have the capacity to do this. As a consequence, you will have to find a charger that has the right pin-out for this device ( + on pin 4 and - on pin 5 ). The tough thing is, there is no way to tell one from the other, they look identical. However, I have found that chargers with a capacity of 1000 ma or greater are pinned-out like above ( + on pin 4 and - on pin 5 ). Other than using a multimeter to verify the pins, the only thing to do, would be to plug it in and see if it works. Hope this helps.

http://www.navigonusa.com/_pdf/manual/Manual_2100_2120_English.pdf

this is your manual .

the same happened to my 2100 3.5 inch. any remediatons?

2 things that might help...use a paperclip and press the reset button (small hole on side, you'll feel a click) hold it for 5 seconds. THEN hold down the power on button for over 10 secs (keep holding while it shows version number) and it will perform a factory reset. You will possibly lose any settings and addresses, but better that than a locked GPS unit.