Sansa Clip + 4GB Dead

I tried. and a removable disk sign showed up in the PC. but it says the disk needs to be formated.

my problem is :i saved several mp3 songs from PC to the clip’s “internal memory” folder.
when i tried to listen to the songs, the screen says not enough space for music DB. please free 90mb. and it just has no response.

and after several times of reset, it is totally dead now.