466MHz "Digital Audio" model G4 Power Mac here, running 10.5.8. Thinking of giving it a CPU and GPU upgrade sometime in the future, as well as a PCI USB 2.0 card. I've done some research, but still have some questions: 1. Is this model of Mac USB bootable? (specifically, from a USB 2.0 drive on a USB 2.0 port on a PCI expansion card) 2. Is this model of Mac FireWire bootable? (using the built in FireWire 400 ports). From what I understand it IS bootable from Firewire (according to Apple's website.) 3. Anybody got experience of doing this? My intention would be to upgrade it and then run it from an external USB or FireWire 400 hard disk instead of from a disk from the built in IDE.