My MacBook has reset by itself

Hi
Something that I can't explain to myself happened with my MacBook 10.4.11. Usually I do not turn it off while I am at home. Today I did and later when I started it again, everything inside was restored to factory settings. All applications and preferences. Folders are missing from my desktop, the bookmarks (safari) are not anymore there. I have found them in folder bookmarks somewhere in the comp. Playlists from I tunes and photos in I photo are missing there. They exist in data folders. Everything, absolutely everything is reset. And now its a big chaos here. Any ideas????

Hi
Did you rename your home folder by any chance? The one with the house icon. If you did follow these steps:
http://discussions.apple.com/thread.jspa?messageID=5786967&#5786967
Tony

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First try a SMC reset:
http://support.apple.com/kb/ht3964
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MacBook Turns off by itself

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My MacBook has reset by itself

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