i recently bought a second hand 15'' macbook pro, and when i turned it on, it always have the previous owner's name on the top left corner, it doesn't go away even if i change the wallpaper, so i guess it's build-in, so plus every other his staff on it, i really wanna reinstall the system and clean up everything. however, i don't have the installation cd, and when i tried to use my friends 13'' installation cd, it says 'Mac OS X 10.6 cannot be installed on this computer'! why is that and what should i do?
cheers~