Use this guide to replace your PRAM battery.

Lay the iMac display-side down on a flat surface.
  • Lay the iMac display-side down on a flat surface.

  • Loosen the three Phillips screws securing the rear panel to the iMac.

  • These screws are captive in the iMac. The center screw will stop turning after about 3.5 turns and the outer screws will stop turning after about 5.5 turns. Do not try to remove these screws from your iMac.

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 - Réponse

That chick MJ is sexy!!!!!

djmadcracker - Réponse

Looks like one of these screws is not like the others... a security Philips?! Never seen one of those before.

Terry Mullane - Réponse

Please Note: If your iMac has an antenna for the airport extreme and not the bluetooth card. Don't buy the bluetooth get the airport extreme instead. Also, some newer devices may not work with these units.

James Janota - Réponse

Just want to say thank you to ifixit! You guys are amazing and so helpful! This was so easy to do and I ordered the part I needed as well! We are up and running over here and my 7 year old son could not be any happier! Thank you!

mary nicolazzo - Réponse

Lift the rear panel slightly from the bottom edge of the iMac.
  • Lift the rear panel slightly from the bottom edge of the iMac.

  • Pull the rear panel toward yourself and remove it from the iMac.

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  • Lift the AirPort card slightly by its plastic tab and pull it straight away from its socket.

  • During reinstallation, insert the AirPort card such that the antenna side is nearest the center of the logic board.

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  • Insert the flat end of a spudger between the body of the AirPort card and its antenna connector.

  • Push the spudger away from the AirPort card to disconnect the AirPort antenna.

  • When reassembling your iMac, be sure to insert the AirPort card the way it was before disassembly.

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  • Remove the two 5.5 mm T6 Torx screws securing the AirPort bracket to the logic board.

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  • Slightly lift the AirPort bracket off the logic board.

  • 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.

  • Do not bend the metal retaining clip up, as it is brittle and will break.

  • 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.

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