Apple PC Compatibility Card - Manual (Page 114)

Replacing the computer cover
30 Make sure all cables and cards are firmly connected.
31 Replace the computer cover.
Align the bottom edge of the cover panel with the computer as shown below.
Then press down on the cover panel until it snaps into place.
Press down on the top edge of the cover panel until it
snaps firmly into place.
Fit the bottom edge of the cover panel into the
floor of the computer.
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