Gateway computer Reference Manual page 46

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CHAPTER 4: Upgrading Your Computer
Slide the tabs of the new color panel up into the slots
on the front bezel.
Press firmly on the lower left and lower right parts of the
color panel to engage the panel's internal locking tabs.
You should press the two points against the computer
until you hear or feel a click, which is the sound of the
panel's internal locking tabs locking the panel partially
into place.
Press
here
While pressing the bottom center of the color panel
against the front bezel, slide the panel release lever back
to the right. The color panel is now fully locked into place.
Press
here