Display screwed up

mt brother was messing around with terminal commands that he found online, and he entered this command"sudo defaults write NSGlobalDomain AppleDisplayScaleFactor 0.857". nothing happened immediately, but later when he turned his computer on and off, the command came into effect, and his screen now has black strips on either side, and the center is zoomed in. does anyone know how to undo this command, or better yet, go back to the default apple display settings? thanks

Yeah i just tried that, and it didn't work. i restarted the computer too, thats what i did to get it the way it is. Is there no way to restore computer to factory settings, or any terminal commands to undo or delete that command, I used a lot of commands yesterday, so it might not be that particular one. My computer is a Mac os x version 10.5.5 macbook pro.

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