My computer wont find a new device when i plug in usb windows 7

I bought a new MP4 from ebay, and it came with a usb cable, however when i plug the usb cable in to my computer, it will not find the device. It will only charge. Please Help :/
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  1. What is the MP4 player?
    Have you tried it in both front and back/known working USB ports?

    Does the MP4 player have specific software/drivers?
  2. have u tried powering up the mp4 player whn its connected..seriously??
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