How-to force iMac to output only to external monitor?

Discussion in 'macOS' started by Jack Flash, Nov 2, 2008.

  1. Jack Flash macrumors 65816

    May 8, 2007
    I'm planning on hooking my iMac up to a HDTV and want it to output video only to the TV. Is there a way to do this. I seem to be only able to extend and mirror.
  2. mkrishnan Moderator emeritus


    Jan 9, 2004
    Grand Rapids, MI, USA
    As far as I know, there's never been a way to do this... the best I can get to is to make the internal display have a black background and make the external display primary -- but this is a hassle, and it's obviously not "off."
  3. seamuskrat macrumors 6502a


    Feb 17, 2003
    New Jersey USA
    I second that. Mirror screens.

    Dim main screen to darkness and that is the best you can do without a potential software hack. There is no setting that is user accessible for this. There MAY be a hack for this, but I am unaware of one offhand. IME, hacks of this type do lead to potential instability.

    I have my iMac hooked up to anice Cinema display and th iMac is tucked away out of sight with the same dimmed configuration.

    I needed the features of the iMac without the cost of the MacPro with the screen real estate of the Cinema. The mini was too underpowered. So I am that mythical mid tower Mac users without a product.

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