I really can't explain why it decided to do that after it was charging, but I believe that your phone is 'bricked'.
There's an excellent guide that even I use in case I have issues with my BlackBerry.
Follow the directions in the guide to, hopefully, alleviate your issue.
http://crackberry.com/blackberry-101-lecture-12-how-reload-operating-system-nuked-blackberry?page=8
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