PowerPC :: IBook Back To Factory Settings Overnight?

I changed the username, passwords, background, settings, name of the harddrive and all that, but left her music and photos on for the time being. Then I turned it off for the night. I remember something popping off before it turned off, and I think it was just saying changes had been made or something like that. And I THOUGHT I had pressed okay to save those changes....it was late. But I turn it on this morning and it's practically gone back to basics. EVERYTHING is gone...no music, no photos. The settings and background are factory status. iTunes, iPhoto, and iChat are responding like I'd never used them. The only thing that stayed was my user name, the photo, and the name of the hard drive. I've looked through the computer and havent found anything. I couldnt have restored it, could I?