Apple Macintosh Performa 600 Series - Manual (Page 105)

3 If you removed security screws earlier, reinsert them now.
4 Slip the three hooks at the base of the back panel into the grooves on the computer
case.
5 Swing the 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.
Reinsert security screws here.
98 Appendix B