iFixit

Remove the following seven screws:

• Two 7 mm T10 torx screws
• One 30 mm T10 Torx screw
• Two 25 mm T10 Torx screws
• Two 21 mm T10 Torx screws

Remove the following four screws:

• One 9.3 mm T10 coarse-threaded screw
• One 25 mm T10 coarse-threaded screw
• Two 22 mm fine-threaded screws

Pull the upper right and lower left corners of the power supply away from the rear case to dislodge the mounting posts attached to the power supply's corners.

Carefully lift the power supply out of the outer case and rotate it to expose the cable lock as shown, minding the DC-out and AC-in cables still attaching it to the iMac.

Disconnect the DC-out cable by depressing the locking mechanism on the connector while you pull the connector away from its socket on the power supply.

Once the locking mechanism has cleared the socket, pull the DC-in connector away from the power supply.

Disconnect the AC-In cable by depressing the locking mechanism while pulling the connector away from its socket.

Remove the power supply from the outer case.

Remove the plastic wall that is installed directly to the right of the LED driver board.

Slightly pull the logic board away from the back of the outer case, then lift it upward to clear the lower front face of the outer case.

In the following steps, you will hold the logic board slightly away from the outer case as you connect the new hard drive cables included with the dual hard drive kit.

As you connect the cables, do not put excessive strain on any of the other cables connecting the logic board to the outer case.

First, locate the small connector on the SSD power cable.