Our old MacBook (2007 2.16 GHz) is still running 10.4. Before attempting an upgrade to Snow Leopard I wanted to clone the HD in case of any problems. I used Carbon Copy Cloner onto a partition of a 2 TB WD MyPassport and the backup was apparently successful - all my data is there. But I can't boot from it. I did some troubleshooting on the CCC forums but with no clear outcome. Apparently some Western Digital drives can't be made bootable, but that's not the case for this one, as I can boot my Air (10.7) and MBP (10.5) from the other partitions on this drive that I've backed them up to. Apparently a USB 3.0 enclosure can cause unbootability for older machines that weren't intended for it, but I haven't seen any discussion of MacBooks being in that category, at least not Intel MacBooks. So I am wondering whether anyone has made a bootable clone of their MacBook, and if so what external drive and connection type did you use? (And which OS?) When I attempt the reboot from the clone, the machine has no problem locating the volume, and I get as far as the Apple logo on a grey background, then I get the message saying I have to power down. Thanks.