I have D1s but I believe they are functionally similar to the D2s. To confirm your connections, try this: Set your camera to manual flash (not TTL) and then try to flash in both the one lightening bolt (LB) and two LB positions on the D2. This will conform if the strobe is getting a flash signal from your camera and which LB position is correct for your camera.
If the strobe isn't working in one of the two LB positions, then most likely you have a connection problem or a battery problem. Check the spot light on the D2 to make sure the batteries are charged. Do you get a ready light on the D2.
If the strobe isn't working, take the FO cable out of the D2 and look into the end as you trip the shutter. Do you see a flash of light coming through the FO cable?
This should get you started on eliminating some of the possible problems.
Make sure that you're connecting the FO cable to the port on the bottom of the D2 just in front of the ball arm connection.
Post some pics of your setup. That should help trouble shooting.
Lesson learned: Always fully assemble and test your gear before leaving home, esp. with new stuff.