Turn off iMac screen with external display plugged in

Discussion in 'iMac' started by Ben Kei, Oct 2, 2008.

  1. Ben Kei macrumors regular

    Oct 30, 2002
    London UK
    Hi, we have an iMac G5 running 10.4.11 which developed some nasty colour banding down the screen and have now plugged in an external display.

    How can you turn off the iMac display so it only outputs through the external monitor?

  2. iGrant macrumors 6502a

    Sep 20, 2006
    I think the only way to do that on an iMac would be to crack the case open and unplug the video cable . . . . I don't think there is a way to do it with software. I know on the Apple laptops you can turn the brightness to the point the backlight is off, but I am not sure you can do that with an LCD display in an iMac.

    OH you could setup your iMac as a Dual Monitor system, making the external monitor the main screen. Once you have done that, just change the background on your iMac screen to a black background and put the brightness on the lowest setting. That would work too!!!!

    Hope that helps.

  3. Lord Zedd macrumors 6502a

    Lord Zedd

    Oct 24, 2007
    Denver, Colorado
    Yep, crack it open and unplug the screen.

    You could also put it lengthwise on the floor like a slim tower unit and put a towel over the screen. You could still access all the ports and you wouldn't have a huge blank screen box on your desk. Just be careful not to block the vent ports.
  4. Advance The Man macrumors 6502

    Apr 6, 2005
    Seriously?! You can't turn off the iMac screen? It's annoying to have the brightest monitor I've seen on while watching the larger tv screen. Anyway (besides a towel, my current solution) to do this?
  5. Advance The Man macrumors 6502

    Apr 6, 2005
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5H11 Safari/525.20)

    My solution is still a towel. Is there not a better solution?
  6. Ikabod macrumors newbie

    Apr 12, 2009
    This works with 10.5.x, not sure if works with 10.4.x, but if you hit the shift+control+eject on an apple keyboard it will turn off the built in monitor.

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