[GODVer3]

With my old mp4 player it wouldn't charge in the wall socket when it was on or off (slider switch) but if I plugged it into the usb socket on my computer, and only plugged it in about halfway into the mp4 player it would charge like that. Also if I plugged it all the way in, I could just choose safely remove device in Windows, but leave it plugged in, and it would charge like that. Just a thought :P Ps I've also heard that you're not supposed to charge when switch is set to off, apparently the battery explodes.
Cheers, Liam