Dec 6 2011
If you own an iMac you’d probably be aware that you just cannot manually turn off just the display cause there’s no hardware button to turn the display off.
Now you can put your screen to sleep by the use of Hot Corners. You can setup hot corners in the mission control on the Mac OS X Lion and they can be activated just by sliding cursor into the specified corners of the screen.
Follow these step in order to set it up: