Macbook will not boot. Locked hard drive. Blue screen when booting

Hi, my little brother decided he wanted a few files off of my mac book, so he went to settings>sharing>file sharing and added my only hard drive to the list and tried removing everyone but his name and password thinking it would only effect people trying to log into my hard drive, not actually me on my computer alone trying to boot mac osx from it.
He came crying to me telling me he paniced because he saw a locked icon on my hard drive and couldn't do anything, so tried to restart the macbook and now i just get a blue screen and nothing happens when i try booting it.
Right now i'm thinking i gotta archive and reinstall from booting the osx disk, but i'm affraid it'll just apply the same settings again and keep me locked out. I need files off of my hard drive since i'm in school and have several assignments that i have not backed up at all.
Any help would be greatly appreciated

after searching the forums deeper i found the solution. it's now working. you may delete this thread.
http://discussions.apple.com/thread.jspa?messageID=2087835

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