OS X Mavericks: Turn your screen saver on or off
If you use a screen saver, it starts automatically after your Mac is inactive for a time. You can choose a shortcut so your screen saver starts when you move the pointer to a corner of the screen.
- Choose Apple menu > System Preferences, click Desktop & Screen Saver, then click Screen Saver.
- Click Hot Corners.
- Choose Start Screen Saver or Disable Screen Saver from the pop-up menu for a corner you want to use, then click OK.
To use the Control (^), Option (⌥), Shift (⇧), or Command (⌘) key together with a hot corner, press the key while the pop-up menu is open. For example, if you press the Shift key, the Start Screen Saver command changes to ⇧-Start Screen Saver.
To deactivate the screen saver and return to the desktop, press any key, move the mouse, or touch the trackpad.
You can lock your screen by requiring a password to turn off a screen saver.