I received my MBP from AppleCare yesterday completely blank. I sent it in simply for them to replace the trackpad, which they did but I also got back my 500GB HD completely empty, with Snow Leopard re-installed. Fortunately I have everything backed up, all my important files...but not in "time machine" mode, just as a basic external HD fashion. Last night with my fresh new MBP and HD I did something stupid and messed around with some of MAC OS X's internal files...why? I don't even know. One of the things I did was change my main accounts name as I didn't see fit what it currently was. Now it says some files can't open because of some file directory thing...The good thing is that since its a fresh install of SL, I have no problem just re-installing it. I have the SL disk I used back in August to install to my MBP that already had Leopard @ the time. I'm wondering to do a re-install do I also need my Leopard disk? I have both disks, just wondering if I can cut out the middle man and just install it by poping in SL disk rather than Leopard disk first, then SL.... Afterward I would install my MBP to my external HD and re-add all my files as needed.