So I keep trying to google why I can't enter Target Disk Mode on my G4 but all I can find is how to do it, which I know. I need to enter it so I can copy my PowerMac G5 Leopard install back to the PowerBook. What happens when I boot it is I hold T and it does go into TDM. Then it sits on the screen for a second and then loads the battery indicator at the bottom. Almost instantly after that it just shuts down. I've lost my Tiger DVD and this is the only way I can get OS X back onto it. Can anyone give me some help?