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I like to use vnc on my ipad on my bed. I want the mac to go to a black screen so I can fall asleep while using the ipad, and not have to get up to shut down the mac afterwards. Is there anyway to turn off the imac screen without sleeping?

I'm open to anything that minimizes the light - so if the backlight is off, that would meet the needs even if the screen is still drawing content.

From a semantics standpoint, let's assume the following:

When the system sleeps, the display sleeps or a screensaver engages are all distinct states. The display is asleep when the backlight is off and the GPU doesn't bother drawing any signal to that display but continues to run. This is different than system sleep where everything except the RAM and network interfaces1 are shut off.

1: Network interfaces that support wake on lan (WOL) only do so when power not from a battery is available.

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up vote 27 down vote accepted

You can turn off your iMac (and your macbook) screen without sleeping via the following keyboard shortcut:

+ +

(Control +SHIFT + EJECT)

Machines like the Air and newer MacBook Pro with no optical drives have the power button in the same place as the eject key and it works similarly for display sleeping shortcuts.

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This command works, but the screen seems to continue to turn itself back on without my touching the keyboard or mouse... I think it's because I'm running an application (youtube playlist with new pages loading after every song). Is there any way to keep the screen off more securely? – Paul Apr 18 '12 at 3:25
The combination for new Macbook without "Eject" key is: Control + Shift + Fn + Power, FYI. – Ngoc Pham Jan 18 '13 at 15:20

Your first stop should be the energy saver preference pane. Dial down the Display sleep slider as short as you can stand it.

enter image description here

If you don't want to wait for this time out, you could also set a hot corner and black screensaver so you could use VNC to set the mouse pointer to the corner to engage a black screensaver so the screen is as dim as possible until the sleep timer shuts off the LCD lighting as well as the data to the iMac screen.

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+1 for the hot corner. very convenient and easy to use. – Rabarberski Oct 12 '11 at 8:55
This doesn't work for me, it'll turn off the display if I'm watching a movie or such. – Harry Oct 12 '11 at 10:38

On computers without an eject button (iMac with non-Apple keyboard; 2011 MacBook Air; etc.), it becomes difficult to put the display to sleep without using a hot corner. The following script will do the job (in Leopard and later), but it must be run with sudo:

original_setting=`/usr/bin/pmset -g | /usr/bin/grep displaysleep | /usr/bin/awk '{print $2}'`
echo $original_setting
/usr/bin/pmset -a displaysleep $magic_number; sleep 1; /usr/bin/pmset -a displaysleep $original_setting
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On of the quick and easy ways I use to put the device to sleep is to use "HOT CORNERS" in System preferences. Its quick, easy, and painless. All I have to do, is mouse over to my top right corner, and my screen goes instantly blank. It puts the screen without putting the computer to sleep. Hope my tip helps

PS:. In Mac OS X Lion you can access hot corners in the Preferences pane under Mission control.

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you just dim the screen all the way down. The controls are beside the escape button in the top left.

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You can use this great open source tool:

Tested on iMac (20-inch, Early 2009) with OSX El Capitan 10.11.4 and Dell U2515H external monitor via DP

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schedule you can set any time you want .I watch tv set it 1/2 hour in the future it works well

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