So my trusty ole, 3.5 year old 12" 1 Ghz PB's harddrive bit the dust this morning. My computer will no longer start up, I can't get it to start in target disk mode. Here is my question. I have all of my apps, documents, songs, photos, etc. backed up on an external HD, but I guess I don't have OS X backed up. Is it possible for me to get a new HD installed and then do a fresh install of OS X? How much do you think it would run me? I'm decently tech savvy- can I install a new HD myself or do I need to take it to a service center? I'm just wondering if it would be a better option for me to just bite the bullet and upgrade to a new macbook. I was really hoping to wait another year, and I'd like to pay less than $300 to fix my PB. Thanks!