iMac G5 20" Model A1076 Power Supply Replacement

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While depressing the connector lock, use a heavy duty spudger to pry the power supply connector away from its socket on the logic board.
It will be necessary to work from alternate sides until the connector is free.
Your power supply may have an ambient light sensor cable attached from the power supply to the logic board. If so, carefully use a spudger to push out the cable towards you using the sides of the cable alternatively to help you slide it out.

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