I successfully installed Leopard on a PowerBook G4 400 mhz machine via Firewire Disk Mode. Of course there are no video drivers for the ATI Rage 128 graphics card used in the PowerBook G4. I tried using an ATIRage128 kext file from Jaguar (10.2) and installing it in the /System/Library/Extensions folder in Leopard under root by dragging it over top the extensions folder, but an error came up saying it was improperly installed. I did refresh the kext file via root and restarted the computer, but the same error message came up saying the kext file cannot be used as it was improperly installed.

Anybody want to try and take a crack at this? It would really help put some juice back in these older G4 PowerBooks, because there is no video card support to speak of Leopard. With some video support, it will be just fine, because the G4 chip rocks in Leopard. Right now videos are completely choppy.

maybe try this:

open terminal:

sudo -s
*password*

chmod -R 755 /System/Library/Extensions/NAMEOF.kext
chown -R root:wheel /System/Library/Extensions/NAMEOF.kext
rm -rf /System/Library/Extensions.mkext


Then just reboot.