Have you made sure it's selected in the 'System preferences' under 'sound' ?
Did you have to install a driver to get it to work ? Your Macbook is an intel based machine but I can't imagine that really having any effect so long as no drivers are needed.
It never showed up in the sound output. No i didnt have to install any drives i just plugged it in the usb and thought it would work cuz thats how i used it on my emac
Have you tried plugging it into a different USB port or unplugging re-plugging it. ?
If it doesn't show up in the sound output then the computer doesn't know it's connected or doesn't recognise them as speakers. Do the speakers still work with the emac ?
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