Check your MP4 player's system requirements.
Some MP4 players are only capable of working with certain
operating systems and hardware, so refer to your player's documentation to
ensure it is capable of functioning with your PC.
Change the USB port your MP4 player is connected to if you
have confirmed your PC can function with your MP4 player.
Disconnect other USB devices, and try connecting your player
to another USB port if you are still having problems.
Try restarting your PC if it is capable of working with
your MP4 player.
Restarting your PC resets non-functioning USB ports, which
may be your problem.
Make sure your USB cable is connected properly.
If your player requires you to install drivers, make sure
you install them.
Try connecting your player to another PC to see if the new
PC recognizes it.
If it does, chances are your computer does not support the
hardware necessary to run your player.
Reset your MP4 player if your PC is still unable to
recognize it.
Resetting your player varies depending on the manufacturer
and model, so refer to your player's documentation.
Contact your player's manufacturer if you are still unable
to get it to work with your PC.
http://applestore.altervista.org/mp3mp4.pdf
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