Apple Power Macintosh (7100 Series) - Manual (Page 12)

Place your computer in the horizontal position.
Make sure that air can flow through the front, top, and back of the computer,
as shown in the illustration.
When you are ready to begin, follow these steps:
1 Plug the socket end of the computer’s power cord into the recessed power socket
(marked with the symbol ≤ ) on the back of the computer.
2 Plug the other end of the power cord into a three-hole grounded outlet or power strip.
WARNING This equipment is intended to be electrically grounded. Your
Macintosh is equipped with a three-wire grounding plug—a plug that
has a third (grounding) pin. This plug will fit only a grounded AC
outlet. This is a safety feature. If you are unable to insert the plug into
the outlet, contact a licensed electrician to replace the outlet with a
properly grounded outlet. Do not defeat the purpose of the grounding
plug!
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