How do I disable dual monitors?

Discussion in 'Mac Accessories' started by mothra1961, Jul 11, 2007.

  1. macrumors newbie

    Jul 11, 2007
    San Francisco Bay Area
    I used to run dual monitors on my mac, but recently decided to go back to just one. Though I disconnected my secondary monitor months ago, my computer still thinks it's there. My mouse goes off the side of my monitor into the space that used to be the secondary one, and items saved to my desktop sometimes also end up there. Frustrating! Please answer for both OS 10.3.9 and OS 10.4.9.
    Many thanks!
  2. macrumors 68040

    Scarlet Fever

    Jul 22, 2005
    Go to System Preferences -> Displays -> Detect Displays. It should realise there is only one display connected :)
  3. macrumors P6


    Jun 11, 2007
    uumm havent u restarted ur mac in that time?? i thout it detected the monitors every time u restarted. strange.. hope its ok now
  4. thread starter macrumors newbie

    Jul 11, 2007
    San Francisco Bay Area
    Still not working

    Scarlet, I don't have an option called Detect Displays. When I go to System Preferences -> Displays the three options I have are: Display, Arrangement, and Color. If I select 'Display' the options are: Colors, Refresh Rate, Gather Windows, and Show Displays in Menu Bar.

    Also, I have restarted many times since I disconnected my second monitor and my situation hasn't changed. This problem is more of a nuisance than anything else, but it would be nice to solve it...
  5. macrumors Core


    Mar 17, 2005
    London, England
    It's in the arrangement tab that you'll find "detect displays". I think that should sort it out.
  6. macrumors newbie

    Nov 22, 2007
    Same problem here

    I have the same problem as mothra1961 has (or had).
    I cannot find a working way to disable that other monitor. I tried pressing the "detect displays" button several times. Not working. I connected and disconnected other display in the mean time. My MacBook still thinks the old CRT Monitor is connected when it's not. (Another annoying thing about it is that the extended desktop holds files i cannot access, since my monitor is not attached.)

    Lately, I upgraded to OS 10.5 Leopard (after having formatted the system volume) assuming that the problem might be solved afterwards. However, it's still there and system profiler even states "yes" next to the monitor's online status. I wish i could simply tick "no" right there...

    Now, I wonder if my hardware is somehow damaged or if a simple click in some application or preferences pane could make the system ignore that darn display.

    Any ideas how to work this out? Or, mothra1961, have you fixed your issue and could you tell me out here?
  7. macrumors newbie

    Dec 8, 2014
  8. Alrescha, Dec 8, 2014
    Last edited: Dec 8, 2014

    macrumors 65816

    Jan 1, 2008
  9. macrumors newbie

    Dec 8, 2014
    I posted because I found/fixed the same issue today on Yosemite. Helping out the next poor sap who stumbles on the original post from a web search (like I did.)

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