iMac Intel 21.5" Retina 4K Display (2017) Power Supply Replacement

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You may find it helpful to set the iMac down on its back for the next couple of steps.
Use the flat end of a spudger to press the release clip on the side of the AC inlet cable connector inward.
While pressing on the release clip with the spudger, grasp the AC inlet cable, and pull the connector straight out of its socket.

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