Apple Mac Performa 5300CD - Manual (Page 119)

4 Snap the base of the back panel into place.
5 Reinsert the security screws.
WARNING Never turn on your computer unless all of its internal and
external parts are in place. Operating the computer when it is open or
missing parts can be dangerous, and can damage your computer.
Reinsert both security screws.
Snap the plastic back panel into place.
109 Installing an Expansion Card