| Key Combination | Use |
| Control-Shift-Function-Power for Macbooks lacking the Media Eject key | Lock screen |
Source: 29 Jan 2013 telephone conversation with Apple Support
Sleep and shut down shortcuts
| Key Combination | Use |
| Command-Control-power button | Force your Mac to restart |
| Control-Media Eject | Show restart/sleep/shutdown dialog |
| Command-Option-Media Eject
(Command-Option-Power for Macbooks lacking the Media Eject key) |
Put the computer to sleep |
| Command-Control-Media Eject | Quit all applications (after giving you a chance to save changes to open documents), then restart the computer |
| Command-Option-Control-Media Eject
(Function-Control-Option-Power for Macbooks lacking the Media Eject key) |
Quit all applications (after giving you a chance to save changes to open documents), then shut down the computer |
| Shift-Control-Media Eject
(Shift-Control-Power for Macbooks lacking the Media Eject key) |
Put all displays to sleep |
Sources: Apple web site and 29 Jan 2013 telephone conversation with Apple Support