how to fix my mp4 player?

I BOUGHT THIS MP4 PLAYER ONLINE. IT WORKED FINE. I DOWNLOADED SONGS AND LISTENED TO THEM THE NEXT DAY. WELL LATER THAT NIGHT I TURNED IT OFF AND WENT TO BED I WOKE UP AND TRIED TO TURN IT BACK ON BUT WHEN I DID IT JUST HAS AN HOURGLASS PICTURE ON THE SCREEN LIKE IT IS ALWAYS STUCK IN LOADING MODE. I CANT FIGURE OUT WHAT HAPPENED TO IT OR HOW TO FIX IT. THE BACK OF MY BATTERY SAYS MP4 BL-4C 3.7V (0710192585588888).THE FRONT OF IT SAYS MP4 DIGITAL PLAYER UNDER THE SCREEN AND THATS ALL IT DOESNT SAY A BRAND NAME ANYWHERE ON IT.