Apple Macintosh Performa 6100 Series - Manual (Page 13)

3 If necessary, switch the computer off.
If you heard a tone when you plugged in the computer, the computer has
started up and you need to turn it off before proceeding. Press the on/off
switch to turn the computer off. (The on/off switch is located on the front of
the computer and is marked with the symbol I.)
Installing an expansion card
If you purchased an expansion card for your Macintosh, install it now. (See
Appendix B, “Installing an Expansion Card,” for instructions.) If you don’t
have an expansion card, go on to the next section, “Connecting the Monitor.”
On/off switch
3 Getting Started