2gb sanssa clip. Freezes on refresh and wont allow me to format.

 i have a 2gb sansa clip.

It charges fine, but as soon as i unplug it from the computer it freezes on the refresh screen.  i have gone into the MSC mode or whatever it is and attempted to individually delete songs off of it but it doesnt allow me to.  as a last resort i tried formatting it but it says it is unable to format.  any ideas??