Hi guys I've bought a Macbook Air recently so I passed my black C2D Macbook to my girlfriend. SHe has been using it for a few days and it was fine until this morning. She called and told me that the mb won't start and just shows a white screen forever. I instructed her to do a SMC reset but that didn't help. Let me tell you what has been done to the Macbook in these few days. 1) I created a new account for her. 2) I tried to make an image of my account but it kinda hanged midway so I force quit it and just deleted my account (done 5 days ago). 3) She installed some HP printer drivers on OSX and a Ricoh printer driver in XP under bootcamp (Bootcamp was setup long before I passed her the mb) 4) some IT guy at her school created a new account to play with and deleted the account right away. 5) Left the mb at school locked over the weekend. That's it. That was what has been done to the Macbook over the week and now it got a white screen of death. Does anyone have any idea on why it is failing? Because I haven't seen the mb personally I asked her to bring it back tonight) so I can't exactly describe how it is failing but I plan to format the drive and reinstall OSX if all fail, which comes to my next question. Because the install disc that comes with the mb is a Tiger, not Leopard, and I got the $50 upgrade disc to upgrade to Leopard, if I want to install Leopard back do I needa install Tiger (using the install disc) first and then install Leopard? My Macbook Air comes with an install disc of Leopard, is it possible if I use that disc to reinstall OSX on my Macbook?