I heard someone on this forum once say that it's a good practice to reformat and reinstall OS X as the first thing you do when you get a new Mac (but people say a lot of things online that aren't correct). Is there any reason to do this? My 4 year old 1 ghz powerbook G4 is still running the same installation of OS X that it arrived with in the mail, and it's treated me great! But I'd rather be safe than sorry, because this new Mac is for my mid-60's Mom, and its her first Mac ever, so I want to make sure that her experience is as perfect as possible. Is there any benefit to doing a reformat and reinstall on a brand new machine?