sometimes all you have to do is rebuild and is works fine after that.
From what I've gathered around the net, if it then asks you to reformat, DON'T DO IT.
Apparently nothing is proven to work after that. Reformat may not fix anything, but you WILL lose your data. When it asks to reformat, simply hit "no", and then reset. Hopefully you will be able to access your data again, at which point I would suggest backing up your data onto your computer HD, and following the steps to remove, reinstall,reformat,and restore all the data. These steps are found with a quick google.









