Hey this is a story about an iMac with a 250 watt powersupply. But now has a 500 watt one that supports sleep mode.
More links to come.
This cable makes it so you can edit the power supply rails (or groups of wires) without ruining the power supply’s.
Here is sort of a preliminary diagram that I made to guide my efforts. I might have made a few adjustments that went unnoticed, but as far as I can tell, this is exactly how the 20″ G5 iMac is re-engineered. It is working as generally stable. The next goal is to get a DC-DC upconverter that as I understand it will take say a 12V 3 Amp line and up voltage to 24V 1.5 Amps or so.