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  1. #1

    fletch33's Avatar
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    13" MBP 2.53 DC2, 09 Mini 2.0 DC2, 07 Mini 2.16 DC2, MB 2.0 DC2, iBook G3 900MHz, G4 Sawtooth 1.6Ghz
    Turn off Main Screen While Using External
    i hate that i cant figure this out LOL

    i have my intel imac hooked to a 52"lcd that i watch movies on and i want to turn off the imac screen because it sits right next my lcd and prevents me from having a nice dark room for movies.

    i am currently covering it with a t-shirt hahaha

    anyone know how i can have it play on the lcd but shut off the main monitor?

    thanks

  2. #2


    Member Since
    Apr 28, 2006
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    iMac Core Duo 20", iBook G4, iPhone 8GB :)
    Not sure whether this will work as planned, but could you try Ctrl+Shift+Eject?

  3. #3

    fletch33's Avatar
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    Jun 11, 2007
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    13" MBP 2.53 DC2, 09 Mini 2.0 DC2, 07 Mini 2.16 DC2, MB 2.0 DC2, iBook G3 900MHz, G4 Sawtooth 1.6Ghz
    i will try this when i head home for lunch.

    it seems like it would be the simplest of things but i haven't been able to figure it out.

    hope this works

    thanks

  4. #4

    fletch33's Avatar
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    13" MBP 2.53 DC2, 09 Mini 2.0 DC2, 07 Mini 2.16 DC2, MB 2.0 DC2, iBook G3 900MHz, G4 Sawtooth 1.6Ghz
    ok that just caused a temporary blank screen on both screens and then back to normal.

    i forgot to mention that i am not using mirroring.

    there has to be answer for this.

  5. #5

    MacGenius24's Avatar
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    Feb 15, 2008
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    PowerBook G4 ,1.67 GHz,120 GB hard disk; Slot-Load SuperDrive DVD±RW/CD-RW
    Am sorry, but no, you cannot turn off the screen. For Some reason, Apple won't let you turn off your main screen and use an external monitor of projector
    G4 1.33 GHz, 1.5 GB RAM, 60 GB Hard Disk, Slot-load SuperDrive (DVD-R/CD-RW). Mac OS X 10.5.6
    G3 400 MHz, 512 MB RAM, 120 GB Hard Drive, Combo Drive (CD-RW/DVD-ROM), Mac OS X 10.4.10

  6. #6

    MacGenius24's Avatar
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    Feb 15, 2008
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    PowerBook G4 ,1.67 GHz,120 GB hard disk; Slot-Load SuperDrive DVD±RW/CD-RW
    The t-shirt idea isn't half bad.... I will try it my self!
    G4 1.33 GHz, 1.5 GB RAM, 60 GB Hard Disk, Slot-load SuperDrive (DVD-R/CD-RW). Mac OS X 10.5.6
    G3 400 MHz, 512 MB RAM, 120 GB Hard Drive, Combo Drive (CD-RW/DVD-ROM), Mac OS X 10.4.10

  7. #7


    Member Since
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    iMac Core Duo 20", iBook G4, iPhone 8GB :)
    Apple has also for some reason not allowed the backlit to go completely off on the iMac. With the notebooks however you can completely turn of the backlight.

  8. #8

    fletch33's Avatar
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    Quote Originally Posted by goobimama View Post
    Apple has also for some reason not allowed the backlit to go completely off on the iMac. With the notebooks however you can completely turn of the backlight.
    i noticed this the other night when i tried the trick of using DVD player ( which although not bad for what it does it just doesn't do much) i went ahead and mounted my .iso movie so DVD player would play it and my iMac screen went dark like i thought i wanted. however it wasn't off it was just not bright.

    WHY?

    seems like a simply thing to me but then again so does a lot of other stuff

  9. #9


    Member Since
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    iMac Core Duo 20", iBook G4, iPhone 8GB :)
    ^^ Yep. The screen works, just the backlight is off. Dunno why this is...

  10. #10


    Member Since
    Sep 14, 2009
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    I have a solution for you. But first...

    Noooooo! Don't cover your iMac with a Tshirt. The crucial cooling vent is located at the top of the back side. It's fairly impossible to drape a T-Shirt over the iMac without blocking this vent. (FYI the intake is on the bottom, and can need occasional dusting.)

    To dim your screen, use one of these two free apps:

    Shades, which is purportedly better but doesn't work on Snow Leopard. Make sure you get the right app, there are two with the same name. (Shades 1.2b2 software download - Mac OS X - VersionTracker)

    Brightness Control, which turns your screen a funny low-contrast tint, but will suit your needs just fine, and works with Snow Leopard (I have it on right now). (Brightness Control 1.0.4 software download - Mac OS X - VersionTracker)

    Both are available on versiontracker.com

  11. #11

    fletch33's Avatar
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    Quote Originally Posted by johninsf View Post
    I have a solution for you. But first...

    Noooooo! Don't cover your iMac with a Tshirt. The crucial cooling vent is located at the top of the back side. It's fairly impossible to drape a T-Shirt over the iMac without blocking this vent. (FYI the intake is on the bottom, and can need occasional dusting.)

    To dim your screen, use one of these two free apps:

    Shades, which is purportedly better but doesn't work on Snow Leopard. Make sure you get the right app, there are two with the same name. (Shades 1.2b2 software download - Mac OS X - VersionTracker)

    Brightness Control, which turns your screen a funny low-contrast tint, but will suit your needs just fine, and works with Snow Leopard (I have it on right now). (Brightness Control 1.0.4 software download - Mac OS X - VersionTracker)

    Both are available on versiontracker.com
    ok i am lost as to how your post has anything to do with this thread?

    - the t-shirt worked for years for me with no problems. i use istat menu and never had an unusually high temp.

    - those dimming softwares look great but do not solve "turning off" the iMac screen while having the extended desktop full brightness

    thanks though
    "i believe louisiana is the pelican state"

  12. #12


    Member Since
    Sep 14, 2009
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    Solving your initial question
    You asked how my post related to your thread. Here's your initial question, about dimming (or completely blacking out) a monitor without interfering with other montitors:

    Quote Originally Posted by fletch33 View Post
    i hate that i cant figure this out LOL

    i have my intel imac hooked to a 52"lcd that i watch movies on and i want to turn off the imac screen because it sits right next my lcd and prevents me from having a nice dark room for movies.

    i am currently covering it with a t-shirt hahaha

    anyone know how i can have it play on the lcd but shut off the main monitor?

    thanks
    The response I gave you solves the problem for people accessing their Mac by VNC or otherwise needing their screen to be dim in a darkened room. As long as this software will dim just your main screen, it will suit your purpose. I have to admit, I don't have multiple screens, so I can't test whether it dims all the screens equally. And now that I look at it again, Brightness Control specifically says it dims all your screens... so that might not work for you if it ends up dimming your LCD as well!

    Maybe you need to make a feature request to have them add control over individual monitors, or maybe you can find another app that does this.
    But definitely don't use the t-shirt as you said in your initial post.

  13. #13


    Member Since
    Sep 14, 2009
    Posts
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    Another easy idea
    Another easy idea, if you aren't mirroring the two monitors, is to draw a big black rectangle in your favorite application, and position it so it covers the whole screen (except the menu bar, but pretty close). It won't be perfect, but might help...

    If you find a better solution, let me know. I'm trying to darken my screen while logged in via VNC, so I can still use over VNC.

  14. #14


    Member Since
    Feb 28, 2009
    Posts
    4
    SwitchResX
    http://www.madrau.com/download/latest/latest.html

    I found this solution on another forum and wanted to verify that it does work on my iMac. I needed it for the same reason as the OP. It's not free, but $19 (as of today) isn't much to fix this shortcoming with iMacs. It took five minutes to setup proper hotkeys and whatnot.

    There's a free trial (which I just tested with). Plan on buying now...

  15. #15


    Member Since
    Mar 10, 2012
    Posts
    1
    Shades vs SwitchResX
    SwitchResX is pretty cool, but it doesn't seem to be able to disable the backlight any better than Shades. Using either program, the screen still has a glow to it. If you have Lion, I recommend Shades.

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