I have done it for a later model powermac G4, but none of these. The only problem in doing this, is that if you use an apple ADC connected display, it won't work on that power supply since mac power supplies have an extra line of 25V for the display that regular power supplies don't. This doesn't affect the functionallity of the computer in any other way. It isn't too hard to do, snip a few wires, some solder here and there, and your done. It's practlicly matching the color of the wires (With a few exceptions)