Introduction
Easily replace your AirPort Extreme card to regain wireless connectivity.
Tools
Parts
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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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Conclusion
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 -