Apple Video System - Manual (Page 46)

16 If you removed security screws, reinsert and tighten them
now.
17 Slip the three hooks at the base of the plastic back panel into
the grooves in the computer case.
18 Swing the plastic back panel up and snap it into place.
Snap the plastic back panel into place.
Slip the three hooks on the back panel
into the grooves in the computer case.
Insert security screws here.
40 Chapter 1