I’m PO'd and frustrated. (I can't mix!!!)

Keystation 49e not working...

Hey... my Keystation 49e worked about 2-3 years ago, but now I just installed Logic Prox X and am aching to use it because it's a lot more efficient than using the onscreen keyboard. When I plug it into my via USB cord, it does not turn on and power up. However, when I plug the adapter into the wall and connect the cord to the port in the keyboard, the lights light up when I turn it on. Now, when I plug the USB cord into my computer, both Garageband and LogicPX don't detect it. Any ideas or directions? My computer runs OSX Mavericks 10.9.2, by the way.
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