I'm trying to fix restore my girlfriends (early 09) Macbook from a backup. Its install discs are missing so I'm using the install disc from a (late 08) Unibody. When I boot to the install disc I get the message "OS X can not be installed on this computer" and get the options "OK" and "Restart". Bewildered, I click OK and go into utilities and pick "Restore from backup", but nothing happens. I'm not sure where to go from here, is it refusing to install AND restore from backup because the DVDs belong to another computer? Or is something entirely different wrong.