My mp3 player wont turn on. I GOT THIS MP3 PLAYER FOR CHRISTMAS AND IT WAS WORKING PERFECTLY FINE.

Question

I GOT THIS MP3 PLAYER FOR CHRISTMAS AND IT WAS WORKING PERFECTLY FINE. I PUT MUSIC ON IT AND EVERYTHING. LAST WEEK MA COUSIN HAD IT AND NOW WHEN I PRESS THE PLAY BUTTON FOR IT TO TURN ON IT SAYS MYMUSIX AND THEN IT JUST TURNS OFF. WHEN I PLUG IT INTO MY COMPUTER IT SAYS FOUND NEW HARDWARE MTP DEVICE BUT WHEN I GO TO MY COMPUTER IT DOESNT SHOW THAT THE DEVICE IS CONNECTED. WHAT AM I TO DO??