Need help with unfreezing the Coby 4G Flash Video MP3 Player!

I was moving music from my Flash Drive onto my MP3 Player without any problems. When all the songs were complete and I removed the MP3 from my computer, the Player started to Update its Library and then froze. I tried replugging it in, but it is still frozen. I tried holding the Power switch for 20 seconds, but that didn't work either. If anyone knows anything about the Coby 4G Flash Video MP3 Player, please let me know.