MacOSX Via shortcut Mac sperren 2. Januar 2015 adhein Control+Shift+Eject is the keystroke for Macs with an Eject key, and for external keyboards Control+Shift+Power is the keystroke for Macs without the eject key, like the MacBook Air and MacBook Pro Retina #Quelle: http://osxdaily.com/2011/01/17/lock-screen-mac/