Alan is using Firewire to connect the camera to the computer, but no computer Alan has tried will connect to the camera. Leo thinks the Firewire port on the camera may have shorted or been damaged. Firewire ports are notoriously easy to short. Since the camera does use P2 memory, he could take that memory out and use a P2 memory card reader instead.
JoeJoe in the chatroom says he can try enabling "mounting" in the camera menu.