Mac Treat #7:
There are a couple of ways to make your Mac shut down or go to sleep immediately, without a pop-up dialog or spinning beach ball. To put your Mac to sleep in jiffy:
Hold down the Option-Eject-Command (the key with the Apple on it) keys all at the same time for about two seconds. On some systems, you can also hold down Option-Command-Power keys.
If you have an Apple remote, you can point it at your Mac, and press the play/pause button for two seconds. The Mac will immediately go to sleep.
To immediately shut down your Mac:
Hold down the Option-Control-Command-Eject keys. Only do this if you really want to power down your computer.
To immediately restart your Mac:
Hold down Command-Control-Eject
You can also hold down the Control-Eject keys at the same time, for the dialog box you’d normally get if you selected “Shut down…” under the File menu in Finder.