Video Import Problems

I'm not sure if this is a hardware or software issue but I can't import video with either iMovie '08 or the previous version. It isn't detecting the camera for some reason when it used to. My older firewire iPod syncs just fine from the same port but otherwise doesn't detect the camera. If I test it on my Macbook it works fine so it isn't the camera. Any ideas on what I can do to get it to work?