how to change the resoulotion of an external display

Discussion in 'Mac Accessories' started by cai876, Sep 19, 2009.

  1. cai876 macrumors newbie

    Joined:
    Aug 24, 2008
    #1
    I have a g3 slot loading Imac, which I am reusing as a computer for a family member who is visually impaired. I have bought a 22" monitor that can display a resolution of 1680x1050. but I can not display more than 1024x768. Another problem is that I can't get it just to display on the external monitor, it uses both monitors with identical pictures.
     
  2. nightfly13 macrumors 6502a

    nightfly13

    Joined:
    Jul 17, 2008
    Location:
    Ranchi, India
    #2
    Ok while I'm not sure which OS you're using (Tiger, Panther?) but I think what you want to do it disable 'mirroring' from display preference. That's why it's 1024x768 - because that's the native resolution of the iMac screen. I also don't know what video card is in there and if it's capable of non-mirror external video (probably is), but that's what you'll want to do. Disable mirroring and then set the resolution. Hopefully your OS is recent-enough to have 16:10 resolutions as an option.
     
  3. cai876 thread starter macrumors newbie

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    Aug 24, 2008
  4. cai876 thread starter macrumors newbie

    Joined:
    Aug 24, 2008
  5. nightfly13 macrumors 6502a

    nightfly13

    Joined:
    Jul 17, 2008
    Location:
    Ranchi, India
    #5
    Ok in Tiger - you click the apple logo in the top left corner, scroll down to system preferences, then chose 'Displays' and from there you should see a button for 'mirror displays' - it might be under one of the tabs from the top middle of the 'Displays' panel'.

    Hope that gets it done for you.
     
  6. SiriusExcelsior macrumors regular

    Joined:
    Dec 6, 2003
    Location:
    Canis Major
    #6
    I don't think the G3 iMacs support extended desktops; they could only do mirrored ones. Some had video cards that were capable, but Apple chose not to enable it; some just couldn't do it at all.

    Try Screen Spanning Doctor:
    http://www.rutemoeller.com/mp/ibook/ibook_e.html

    I can't guarantee that it'll work, and, since it's such an old program, I can't guarantee it won't crash your system either. Good luck!
     

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