I have a 2004 iBook G4. My internal HD broke yesterday, but I have a backup on an external firewire HD enclosure, made using CCC. I've tried to boot from it using the startup disk tool on the install DVD: it comes up as a useable startup disk, but when it restarts I get the blinking folder icon for a few seconds, and then it boots from the internal HD (or tries to.) Disk utility says it is bootable, I can mount it and edit files using single user mode from the internal HD, etcetc, but it just won't boot from it. I've even tried to go into Open Firmware and boot yaboot from the external drive, but it doesn't seem to see the drive at all until after OS X is booted. What's going wrong? Any help would be appreciated.