For the pins conversion scheme I used these:
http://www.subedartech.net/docs/pc/connector_atx_pinout.GIF
http://www.xlr8yourmac.com/images/imacg5_power_supply_pinout.gif
The only confusing thing about the iMac diagram is that the "blue" wire is really gray, and the real blue wire is -12VDC, and not used.
The +24VDC is not needed on the 17" iMac G5s, and I have not figured out what it is supposed to do.
I think the general electric requirements are listed in the above links.
http://www.subedartech.net/docs/pc/connector_atx_pinout.GIF
http://www.xlr8yourmac.com/images/imacg5_power_supply_pinout.gif
The only confusing thing about the iMac diagram is that the "blue" wire is really gray, and the real blue wire is -12VDC, and not used.
The +24VDC is not needed on the 17" iMac G5s, and I have not figured out what it is supposed to do.
I think the general electric requirements are listed in the above links.