I have to take my MacPro in because I believe this thing is supposed to be quiet and I can hear my fans running loud and fast constantly. That said, I refuse to hand over my machine with my personal data. I was considering swapping the 500GB drive in bay #1 with a 1TB drive that I have sitting in a box. Can I use the restore discs that came with my MacPro to install Leopard onto the new drive? If not, can I back up my 500GB (stock) drive using Time Machine, turn time machine off, reinstall OSX so it's essentially wiped, then upon return of my machine can I go back into TM and get back all my apps and such? All I care about is not sending the machine with a hard drive full of stuff and ensuring my data is backed up so I can easily stick it back onto my drive.