I have 2 macbook and 3 hd... I just took the hd of 500Gb from my old mac and put the old HD back there... Now I want to put this 500Gb hd in my new mac but I cant boot the DVD os the OS... If I insert the dvd with the mac on open the intaller and click in restart, it restart to the OS. If I hold ctrl it opens the OS... If I hold shift, it shows the CD but when I click on it, it opens a softblue screen and after some time turns out. I think my CD is broken, so, is there another way to install? am I able to pick the installer somewhere?