My Macbook 10.4.11 completely reset all my computer settings overnight. All my settings are gone, folders rearranged, iTunes playlists etc deleted and browser history cleared. How can I restore my previous settings? My account settings in system preferences are set to 'Automatically log in' as my original account name. I don't have time machine and didn't do any backups, although I did copy paste all my documents and applications to an external drive several months before everything was wiped out. It seems my laptop has automatically reset itself to factory settings overnight? Is there anything I can do to revert back to my previous settings?