Apple Macintosh Performa 5400 Series - Manual (Page 161)

5 Reinsert the three screws.
6 Reconnect the power cord.
.
WARNING To ensure reliable and safe operation of your system, never
turn on your computer unless all of its internal and external parts are
in place.
Plug the power
cord into the back
of the computer.
Reinsert these screws.
160 Appendix E