Removing the Side Panels
1 Loosen the two thumbscrews on the right side of the back panel. (You may need a flathead screwdriver. These screws do not detach; they’ll stay on the side panel loosely until you tighten them again.)
2 Pull the panel toward you until it stops. Lift the panel off the chassis and set it aside.
3 If you are replacing an optical drive, remove the other side panel in the same manner. Note that the screws on this panel detach and are loose from the panel.
4 Gently lay the computer on its side. (Skip this step if replacing an optical drive.)
Replacing the Side Panels
1 To replace the side panel, align the notches on the panel with the holes on the chassis, slide the side panel forward until it locks in place, and then tighten the thumbscrews on the side panel.
2 Repeat for the other side panel if it was removed.
3 Reconnect (in this order) the power cord, the modem/telephone cable, and then all other cables.
Thumbscrew 
Thumbscrew
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