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Step 4: Pull the Plugs
Before you start removing plugs from the motherboard, do yourself a favor and take some photos of the board with everything plugged in. Also note the cable routing. If you're the cautious type - except we know you aren't because you're undertaking this project - take individual shots of each plug's neighborhood to make sure you remember how to reconnect everything correctly. Now proceed to unplug everything from the motherboard. Caution: This is extremely delicate work - and if we have to tell you to pull on the plugs themselves rather than on the wires, perhaps you should abort now before doing (more) serious damage to your iMac.
The plugs are even more delicate than they look; we broke one and had to make a permanent connection with the soldering iron.
Step 5: Selective Screw Removal
Remove the screws circled in yellow in the photo for step 4 (above). Be sure to mark each screw with its location to spare yourself big headaches later. Do the same for the AirPort, Bluetooth, and IR modules. Don't touch either of the pieces that look like heat sinks (as indicated in our photo): One stays put, and the other we'll free up from the backside in a later step.