I thought I'd take a stab at this one, given the fact that I was experiencing a similar issue a little earlier today with my iMac and a Panasonic DVX100A camera.
Have you opened System Profiler to confirm whether or not your Mac sees anything connected to its firewire bus? Go to the Apple drop down menu at the top left of your screen>about this mac>more info>firewire. If you see red text indicating that nothing is connected, quit FCP and incorporate a POWERED firewire hub between your deck and your Mac. I use a 6-port Belkin model that's smaller than a pack of cigarettes. Plug in the hub, restart your Mac, then check System Profiler again. This time, it should see your deck. If so, you're on your way... (I'm just assuming that your easy setup preferences are what they need to be in FCP)
Hope this is helpful.