Facing the front of your Mac, drape your forearms over the top and grasp the two cover retainer clips and unclip them with a lifting motion. Tilt the top up and remove it. Installation is the reverse of the removal process. Some Macs have a single large flat-head screw holding the the cover on, unscrew this noting that it usually does not come out completely. Slide the cover foreward and lift it off to remove it.
Installation is the reverse of the removal process.
Squeeze these upward and slide the case toward the front and lift it off. Installation is the reverse of the removal process. A unique feature, you can actually open this machine's case while the unit is powered on and running. Opening the case is accomplished by simply placing your index finger into the round latch hole on the upper right side of the cabinet. It is not recommended that you attempt to open the iMac's case.