I'm just having a hell of a time getting Tiger onto my clamshell iBook at the moment... My external USB DVD drive *WILL* boot the Tiger DVD, but of course a stock Tiger DVD will refuse to install. Booting into 9.2.2 or 10.3.9, XPostFacto won't let me select the Tiger disc to boot from, saying it's not on a bootable device!

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just install tiger in a newer mac, and transport the HD over to the clamshell. this worked very well for me, i put the old hard drive from my pismo into a lombard (101), and it works fine, and i took the old hard drive from my newer key lime ibook and put it in a 300mhz ibook, and everything works great in both computers (but they are a little slow...)