I did a post a while back on how to clean out my mac because again it wasn't booting up and I got sick of the errors so I wanted to start all over. I'm in the same dilema. I already have everything backed up but I was wonderin how do you do it again?? I got my brother one but his has crap extra/old files on it and I jus wanted to start his over again too. Bottom line...........What are the steps to starting all over with a Ibook??