I have had a Casio LK43 keyboard for a while now. However, it is just recently that I tried using it as a MIDI controller for a DAW. When I plug it into my computer, some of the keys (close to half) do not register within the DAW, but the MIDI cable detects a signal from them. I have run a MIDI diagnostic program, MIDI-OX, on the controller, and it says that the broken keys emit two on signals, but not an off signal. I have opened up the bottom side of the keyboard to see if dirty connection points were the source of the error, but the connectors looked fine outside of usual wear and tear of time. I would really appreciate any other assistance in figuring out what would cause only certain keys to stop working.