External monitor to iMac mid-2007: only black

Discussion in 'iMac' started by shu-gu-shot, Dec 11, 2013.

  1. shu-gu-shot macrumors newbie

    Joined:
    Mar 21, 2012
    #1
    Hello, I have a mid-2007 iMac 2.4 GHz (ATI HD 2600 Pro).
    I connected a (working, tested) Dell U2413 with (working, tested) DVI cables to my iMac using a mini-DVI—DVI adaptor (not tested elsewhere, but with proper electrical continuity between respective pins).
    The iMac has never had any external monitor before.

    Mavericks detects correctly the monitor (model, resolution) and the monitor "feels" a computer connected, but I get only "powersave" in the monitor, nothing is displayed.
    Please note that "powersave" is not the same as "no signal". Both devices are detecting each other, but no image is arriving.

    Could you please help me? I have to quickly decide whether to return it of keep it.

    Thank you very much.
     
  2. TyPod macrumors 68000

    TyPod

    Joined:
    Nov 2, 2006
    Location:
    And Yourself?
    #2
    Do you know what resolution the external monitor is trying to run at? There's a chance it may be out of range, but I doubt that since it's a 24 incher.
     
  3. shu-gu-shot thread starter macrumors newbie

    Joined:
    Mar 21, 2012
    #3
    Resolutions are correctly identified: max 1920x1200.
    I tried all of them, same issue.

    I wonder whether it'a a mini-DVI adaptor, imac or mavericks issue.
     
  4. shu-gu-shot thread starter macrumors newbie

    Joined:
    Mar 21, 2012

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