I plugged my Mixtrack to my Macbook and the lights come on the Mixtrack but nothing else happens. What's going on?

i brought a mixtrack from a guy on ebay, he sent it out, I plugged the usb in my macbook and the lights come on the mixtrack, but nothing else happens, Is it suppose to come with a cd to install the hardware the hardware? I downloaded serato but it says hardware disconnected. I am not too sure what to do. Thanks
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