Take a good look at these power connectors and hope you are not working with the round version above. I gave my son my older G4 Power Book and today his power supply has packed in…can I get a new one let alone a second hand one. Apple should be ashamed of themselves by changing the power plug from the round version to the square four pin version leaving all the round pin users to drown in it’s obsolescence.
They are so proud of their “unique” look all the way through to the 24.5v power connector which lights up when plugged in, yet they care not a jot when they decide to re design such a crucial part of the design. My advice is buy a spare 5 pin power lead while you can if you intend using your MAC long after the power supply has been re designed !