Alright this is my first mac that "I" own, at my parents we have an imac and a mac pro so I am fimiliar with them but have some questions. I got the base model with -$100 from educational discount then -$100 from getting the iphone on launch day. If I switch out the hard drive myself the warranty is void but if I have any problems and I just put the old hd back in what would happen? They said if I upgrade the ram I have to get apple ram so the warranty isnt voided, whats stopping me from just putting the old ram back in if I have a problem? Also is there a guide to replacing my macbook hd with a WD mybook portable hd? Like the formatting and opening the macbook?