Einleitung
The iMac uses an incredibly hard to get to power supply. It has 24-Pins. This will require taking the iMac fully apart.
Werkzeuge
Ersatzteile
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            Start by flipping the iMac upside-down. It may help to lay it on a towel, so you don't damage the screen, or scratch the face. 
 
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            Remove this Phillips screw. 
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            Using a flathead screwdriver, work your way around the bottom cover, until it comes off. 
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            Then, lift the bottom cover up and out, and set it aside. 
 
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            Now, remove the DB-15 Video connector from the logic board. 
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            It may be helpful to use a Phillips screwdriver to remove the thumbscrews. 
 
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            Remove the front panel connector. (You may also need to remove an additional screw that connects the front panel connector to the logic board assembly). 
 
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            Now, remove these Phillips screws. 
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            Now, grab the logic board assembly by the piece of plastic, and lift it out. 
 
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            The logic board assembly. This is the heart of the computer, it contains the motherboard, CPU, RAM, V-RAM, PRAM battery, the hard drive, and the optical drive. 
 
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            Removing the front bezel: 
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            There isn't a great position to put the iMac in to remove the front bezel. I recommend flipping it so it it like it would normally be positioned. 
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            Remove these two Phillips screws. 
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            Now, work your way around the bezel with a flathead screwdriver, and then, pivot it up towards the top, and remove it. 
 
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            Removing the translucent plastic: 
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            Removal of the front bezel will reveal two screw covers on the top, pop them off with a Phillips screwdriver. 
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            Now, use a Phillips screwdriver to remove the screws. 
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            You can now remove the plastic. 
 
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            Power Supply: 
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            Removal of the EMI shield will reveal two major circuit boards. 
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            The Display Driver: 
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            The Power Supply: 
 
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            Now, swing the board out, and remove the following connectors: 
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            AC Power 
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            To System Fan 
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            Don't remove this. It comes free with the logic board power. 
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            To Display Driver 
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            The connector that is attatched to the logic board; to remove it, simply thread it through the hole in the metal: 
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            Now, you should be able to remove the power supply. 
 
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To reassemble your device, follow these instructions in reverse order.
Ein Kommentar
i have exactly this problem with my vintage imac g3 took it to repair shop they said could not find it do you know where i can get this power supply and pay to have it installed