I have an old Symbol LL500 scanner interface box and a scanner to go with it. The box's original cable used one of the old microsoft mouse connectors, but I got a converter to USB. The problem is that when I connect it to my MacBook, the interface powers up and works, but the computer dosen't recognize it or even say that a device is connected. Is there any way to make it see that the interface is there or am I just screwed?