iFixit

Rotate the mini so that the SuperDrive slot loading mechanism is facing you.

Use a pair of tweezers to lift the hard drive thermal sensor cable connector up off its socket on the logic board.

Use tweezers to grab the connector (as seen in the picture), not the wires.

The connector is located under the optical drive opening, next to the PRAM battery.

In the next few steps, you will remove the four Phillips screws securing the internal frame to the bottom case. Included in each step is an overview picture showing the general location and a closeup showing the actual screw.

Remove the recessed Phillips screw near the power button securing the internal frame to the bottom housing.

Remove the recessed Phillips screw near the sleep light securing the internal frame to the bottom housing.

This screw is the longest of the four screws securing the internal frame to the bottom case.

Remove the Phillips screw from the internal frame near the Bluetooth antenna.

Remove the Phillips screw near the audio ports securing the internal frame to the bottom case.

Gently lift the internal frame up from the bottom housing, minding the AirPort antenna and any other cables that may get caught.

It may be necessary to pull up near the interconnect board to separate it from the logic board.

Simultaneously pull the tabs on each side of the RAM chip away from the center of the chip. These tabs lock the chip in place and releasing them will cause the chip to "pop" up.

Pull the RAM chip directly out from its connector.

If there are two RAM chips installed, repeat the above procedure for the second chip.