Step 2:  Plug in the power cord.

Plug the power cord completely into the recessed power cord socket on the back of your Mac Pro and plug the other end into a grounded power outlet.

Power cord socket

Power cord plug

12Chapter 1   Ready, Set Up, Go

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Apple MC561LL/A, MD772LL/A, MD770LL/A, MC560LL/A manual Plug in the power cord