hi, i'm having trouble with my computer not reading the cameras attached to my firewire port. i have a 4-6 pin firewire cable. i have tried with both finalcut and imovie. in finalcut, it says the firewire device is missing. in imovie, when i put the little slider under the image to camera mode, it doesn't list anything as an option other than the built in macbook camera. in no way has my computer recognized that there is something on the port. i have the camera set to playback mode. i have also tried restarting the computer. the camera was bought refurbished- is it busted? thanks!