My macbook recently had a kernel panic while running Leopard i got from the previous owner. (restart screen at turn on, would keep showing it.) I re-seated the ram, tried with one out and one in, vice versa, reset the PRam, the NVRAm the EVERYTHINGram, still no go. I reinstalled the os using the install disks that came with my macbook, but of course it had to come with tiger, so now im back in circa 2006. I also have a macbook pro. Would i be able to use the macbook pro's CD on my macbook to give me Leopard? Thanks guys. By the way, i called apple store and they gave me some BS about not being able to install leopard if the machine originally came with Tiger, all after i explained my situation.