I bought the memorex mp3 -MMP8565C / MMP8575C / MMP8585C. When I plugged it in to charge it the battery charge indicator was showing. When I checked it again about 3 hours later it was off and I can not get it to turn on. I have tried holding the power button down along with trying every other button on it. Can you please tell me what can be wrong with it. I know the battery was charging when I first plugged it in b/c of the battery icon lines was moving.