Apple Macintosh Performa 6400 Series - Manual (Page 145)

8 If you installed an Ethernet card, change the network connection in the Network
control panel.
See the manual that came with the card for more information. For
instructions on how to select a network connection and other information
about using your Macintosh on a network, see the “Networks” topic of
Macintosh Guide, available in the Guide (h) menu.
Closing the computer
1 Grasping the plastic tabs on the vertical plate, orient the logic board vertically and slide
it into the guide rails on the left inside of the computer.
Align and insert the logic
board so that it engages
the guides on the top
and bottom of the
computer chassis.
145 Installing Expansion Cards