I am trying to install Leopard on 2Ghz Macbook. I put the disc in, double clicked 'Install Mac OS X', and then clicked the restart button the box that popped up. The computer restarted, but the disk never would start. It sat for an hour without doing anything (the loading symbol was spinning under the Apple logo) I went to 'Startup Disk' and set the install disk as the drive to boot from, but it did the same thing. The wheel has been spinning for an hour and a half? Any ideas on how to get the disk to load so I can start the install?