mp3 player help?

i have just brought an onn player from asda eveytime i try to load tunes on it no file comes up yet when i plug back in it says i have them on

Chris F2007-10-23T05:21:59Z

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Exactly the same thing happens to me. When I do get some songs onto the mp3 player and press play it says 'not allowed' on the LCD screen. I'm considering taking it back to the store for a refund.