Introduction
Regain wireless connectivity by replacing your dead AirPort Extreme card.
What you need
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Loosen the single Phillips screw in the center of the access door.
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Remove the access door from your iMac.
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Remove the following 12 screws securing the front bezel to the rear case:
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Eight 13 mm T8 Torx.
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Four 25 mm T8 Torx.
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Use the flat end of a spudger to pry both antenna connectors up off the AirPort Extreme card.
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Almost done!
To reassemble your device, follow these instructions in reverse order.
Conclusion
To reassemble your device, follow these instructions in reverse order.