another atx for old mac question

2 replies [Last post]
Joined: Jul 13 2007
Posts: 180

recently,I heard about atx power supply can create switch.first I cut original green and any gnd line.try to touch each I can feel power on for fan and 4 pin plug.but the quesiton is coming.I try to test my old mac for macintosh II and apple II gs motherboard.suddenlly,I just see the powerlight like flash.light on and light off.keep going on.I don't know why.can u explain it?or old mac can't used atx power supply.I really want to used atx power for my old mac.thx

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Hawaii Cruiser's picture
Joined: Jan 20 2005
Posts: 1434
I'm curious to know where you

I'm curious to know where you've heard that an ATX power supply will work with a Mac II or Apple IIgs? Do you have a diagram of the power connector pinouts for those motherboards? The only Mac I'm aware of that can use an unmodified ATX power supply is the Beige G3, and you have to change a jumper on the motherboard in order to do so. I wouldn't plug a non-OEM PSU into any motherboard until I've got all the facts about each and every pinout first. Sounds like a really good way to cook your motherboard. Just one wrong pin connection could kill off your motherboard.

littlejohn's picture
Joined: May 18 2005
Posts: 114
ATX to Apple IIGS

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I make a ATX to IIgs adapter, and it can be found here:
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