Everything scrubbed on mp3

I had my mp3 connectiong to the computre through the usb and i was uploading songs to my mp3 through my computre i took the usb out and it then said do not remove usb but i already did, and now the hole thing is srubbed even where you go ito the music or photos there is nothing saying music or photos just the picture and even all of the radio stations have gone oh and when i plug usb in it ussually says connected or something but it just has a white blank square, what do i do its like everything is just gone on it. and when i plug it into usb and then i go into my computre it wont come on there. help