Connecting ATX Power Suply to Imac G5

[mbm]

Hello,

I found a diagram for connecting a standard ATX Power Supply to an Imac G5. I don't really understand exactly what I have to do though. There's a lot going on in the diagram, at least for me, and I don't know what physically has to be done. If someone could explain, I'd greatly appreciate it.

http://supercollidercomputers.wordpress.com/2010/04/16/diy-imac-g5-power-supply-atx-external/

 

[mbm]

https://discussions.apple.com/message/10597939?messageID=10597939#10597939?messageID=10597939

I found that post on another forum. Could someone help me do what "spudnuty" did there. I'm still a little unclear with this. I need an idiot-proof 1st grader explanation pretty much.

Thanks