Unlikely. I *think* 6 pin firewire has a power supply to the camera. But I don't think a video camera would use it. Either way, a 6pin/4pin lead should work fine, unless there's something wrong with the actual lead itself. It's either gonna be your firewire card, the cable, or the camera. Try a new cable first, if that doesn't work, try a new card or camera (Or other firewire device).