I got the same problem.
First the player wasnt recognized by any computer so I was stuck with the song inside them.
So I formated the disk and all suposly was fine, when i started the player I got a messar
boot error, shutting down
The trick was that when I formated the player, it has to be in Fat 32 with 4096 bites
(to format it by the way, conect the player to the pc, go to my
computer, select the player, right click, and select format with the
spects fat32 and 4096 bytes)
Then reinstal the firmware included in the cd.
this solved my problem and im very, very happy to have my player working again. I love my player!!!.