Hello all, Im selling my macbook pro and am trying to restore it to factory settings. I have inserted the "install disc" many times. However, my laptop is never able to start up. It alternates between a black and grey (no apple or wheel) screen. I've tried holding down the "C" key while rebooting..that didnt work. I've tried clicking restart when it instructs me to...that didnt work I've tried going to system preferences --> startup disk --> clicking the install drive and it still didnt work. What can I do? My mac can start up and work perfectly fine without the disk, its just that i need to restore it to factory settings.