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If you have a MacBook, MacBook Pro, etc that you can remove the battery from here is what you do:

Shut down the computer (again, full-on off here)
Disconnect the MagSafe plug from the machine
Remove the battery
Press the power button for 5 seconds and release
Put the battery back in and reconnect the MagSafe cord
Turn your machine back on with the power button
For MacBook Pros, MacBook Airs, and MacBooks where you can’t remove the battery on your own, here’s what you do:

Turn off your machine (really, you knew this was coming at step one)
Keep the MagSafe adapter plugged in.
Press at the same time shift-option-control (on the left side of the machine) and the power button
Let go
Turn your machine back on with the power button.
Note that you keep the MagSafe in for MacBooks that have the built-in battery and out for MacBooks where you can pull the battery out.

For Mac Minis, Mac Pros, iMacs, and Xserves (really on a server?):

Shut the machine down
Unplug it from the power
Press and hold the power button for 5 seconds
Plug it back in and turn it on.

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