Bad luck, Tufty:
If it's anything like my old model Iriver, then on the bottom edge there's a loose cover strip that you can pull loose to get at the card slot, the usb socket and between them there's a little hole marked "reset" that you can just about get a paper-clip or similar into.
Try that. Not sure whether the machine has to be on or off at the time - probably on of course.
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