I'm having the same problem! Mine isn't even a year old and it's completely stopped working. It won't turn on or show up on the computer. As far as I can tell, it's a dead hunk of metal and plastic. I Googled someone on Yahoo answers experiencing the same problem... I plan on buying a new lithium battery for it.
I'm just so upset I can't stand it!! I spent so much money for what I though was a reliable mp3 player...
freaking out, February 2010