On Mar 13, 2012, at 8:16 PM, Jonas Lopez wrote:

G4 USB external hd will not start up 10.5

Yes, this is true.

Only a very few of the USB 1.1 Macs can boot from USB, only the "colored" iMacs & iBooks, and none of the G4's can boot from USB AFAIK. You'll need an external enclosure with both USB 2.0 & Firewire, and boot the G4 from Firewire. If your Intel MacBook has Firewire, you could get by with Firewire only, otherwise you'll need both USB2 & Firewire.

Leopard 10.5 is the only version of OS X that can boot both PPC Macs & Intel Macs. You must format the HD as GUID, and it will boot both PPC & Intel Macs.

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