Try to avoid connecting Camera external HD Mac but import directly to the Mac then move (Hard to find out - else than import/export to another Mac ceased to workĮverything else is OK eg recording and playback to TV) This is lethal to the A/D-chip in the Camera = needs an expensive repair.
Sorry to say it is to easy to turn the 6-pin end of the FW-cable 180 deg wrong. Camera set in Playback mode - NOT Recording mode.Camera connected to 'charger' (mains adaptor) - not just on battery.Some Cameras has a Menu where You must select DV-out to get it to work.Test Your Camera on another Mac so that DV-in still works OK.Test another FW-Cable *very often the problem maker*.