Apple Macintosh Performa 6400 Series - Manual (Page 170)

5 Unplug the power cord from your computer.
You can unplug the power cord now that you discharged static electricity in
the previous step.
6 Grasping the two plastic tabs, pull the panel toward you until the logic board slides out.
Gently but firmly
pull the logic board
all the way out of
the computer.
Unplug the power
cord from the back
of the computer.
170 Appendix B