What type of cable are you using? I have seen two different styles of cable - 1.) Controller-to-drive. Cable goes directly from controller into the drive itself with no bulkhead connector. (RL connector on one end, berg connector on the other end) 2.) Controller to bulkhead adapter, then standard RL cable from bulkhead adapter to drive. Ribbon cable goes from controller to an intermediate (bulkhead) connector. (Bulkhead piece has a berg connector on one side, and an RL connector on the other.) If memory serves, and you are using the bulkhead style intermediate connector, an incorrectly pinned ribbon cable could produce similar results. I don't recall if the ribbon cable is pinned straight through, or if one of the connectors is flipped. Just a thought. T