Introduction
Use this guide to replace your PRAM battery.
Tools
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Lay the iMac display-side down on a flat surface.
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Loosen the three Phillips screws securing the rear panel to the iMac.
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Lift the rear panel slightly from the bottom edge of the iMac.
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Pull the rear panel toward yourself and remove it from the iMac.
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Insert the flat end of a spudger between the body of the AirPort card and its antenna connector.
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Push the spudger away from the AirPort card to disconnect the AirPort antenna.
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Slightly lift the AirPort bracket off the logic board.
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De-route the AirPort antenna through the slot in the AirPort bracket.
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Slightly insert the tip of a spudger (or any other small wedge-shaped object) under the PRAM battery directly across from its retaining clip.
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Use another spudger to slide the PRAM battery out from under its socket's retaining clip.
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To reassemble your device, follow these instructions in reverse order.
My iMac has only ONE catch, the central one, so the two outer screws are not to be touched.
In fact, I tried so hard to unscrew them, with a good screwdriver, that my hand hurt. Knowing that some times captive things (like these screws or a faucet) can be already at the end of their travel and we only lock them further into that position, I tried both screwing and unscrewing to no avail.
paulfrancoeur -
The two outer screws each drive a locking bar that engage tabs on the rear panel.
They definitely need to be unscrewed.
Dale Stanbrough -