Hi jaetyl,
I would check the USB cable as it may be a faulty USB cable that is causing the problem of your MP4 not connecting to your player. Hopefully it's as easy as finding a replacement USB cable and using that to see if your computer picks up your player. The other possibility is that one of the pins on the USB on your player is faulty, which is going to be a real pain as that's not easy to replace. But I would try to find a replacement USB cable and try that to see if that works.
Let us know.
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