I used a program called carbon copy cloner to make a clone of my father's mac book pro onto an external hd usb. I already erased the laptop so I can't go back too it for another copy so I'm stuck. Anyhow, all the data copied over nicely. However it said it will make the drive bootable. But it does not. I partitioned GUID so it should boot cuz intel macs can boot usb if partitioned GUID. But it won't boot on the macbook pro intel or my mac mini intel. Both core duo (not 2 duo). And I can't reinstall because the dvd is 10.5.0 and we have 10.5.8 on the external. Unless there is a way to remove 5.8 and go back to zero but I don't hink so. I did Disk first aid and it says the drive is fine. It is brand new. And it won't let me verify or repair permissions. Don't know what to do.