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How To Lock Or Sleep The Screen In Mac OS X? If you wish to keep your Mac device safe, then you should lock the Mac’s display. Having a user account password gives a layer of protection to your important files.For having the Mac lock screen feature to be effective, the first step that should be taken by you is configuring the System Preferences to need the user account password whenever unlocking or else waking up.  For more details go to;- http://setupmenow.com/how-to-lock-or-sleep-the-screen-in-mac-os-x/