I'm thinking about buying a MacBook Pro (15.4" 2.4 GHz 4GB RAM MB470LL/A) for $1,175. It has been dropped and "sporadically freezes" but is otherwise just fine. I'm thinking this could be a good deal because: 1) It still has Apple Care warranty, so they should be able to service it, right? 2) The most likely cause of the freezing would be the hard drive? If so, I already have a replacement I can use in it. 3) It might just need a OS reinstall? Thoughts? Thanks!