rear cover
To remove the rear cover, first remove the hard drive...
(Roll mouse over image)
...the optical drive...
...the stand cover...
...and the stand.
Detach the four screws for the rear cover.
Pry up on the top edge of the optical drive bay area and the cover should pop free. Lift the cover off the unit.
...That fit under the outer lips of the front bezel and the side caps.
To replace the rear cover, align the cover onto the unit and press the cover firmly until all tabs have snapped into place.