I have half a dozen g3 desktop power supplies sitting around and another half dozen original imac trays. I've gone all out (for iMac 233 that is) and bought ram so that all of them are 256 and up and I plan to netboot. Then my little stack which can be ata/usb/cd workstations and say rip, record usb audio, or zero hds. thinking of even making one sql or apache. Of course this is all dependent on hooking up the imac mb or power filter to the power supplies. Searched the web but can't find any wiring diagrams for that ps. ATX conversion seems to be big but I would like to recycle these components. If I had a multimeter I could make further progress (so I will go off and do look for that now), but any help would be appreciated (also trying to just hotwire them on so I can also for extra outside drives). They are 150 W so could I possibly hook up two boards to one ps?

Working on a deluxe power tower pro but still have a lot left to do (better ram+video, some acrylic work and eventually the a 1ghz processor).

If the power supplys came from say B&Ws then you can easyly follow the ATX mod. Just have to remember Pin8 is +3.3V and Pin18 is ground. The rest is the same as a PC ATX powersupply. If they came from a diffrent G3 like a Begie then I have no clue. I don't know if the powersupply wireing is the same or not.

Um sorry, B&W PSUs only have one different wire to ATX. ATX has a -5V extra. The iMac does not require a -5V feed.
Beige G3 PSU is ATX already.

This should also help:

http://www.ct-scan.com/iMacATX/#convertpower

http://www.outofspec.com/frankenmac/wire.shtml

Post edited by: waragainstsleep, at: 2006/01/05 20:07