Remove the following 3 screws:

• Two 7.5 mm Phillips from either end of the left I/O frame.

• One 9 mm Phillips from the middle of the left I/O frame.

Remove the small black plastic spacer at the bottom of the left I/O frame.

Lift the left I/O frame up and out of the computer. Pay attention to the thin metal EMI fingers, as they may catch as you remove the left I/O frame.