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  1. #1

    Member Since
    Apr 12, 2008
    External Monitor refresh rates

    I have a 2006 iMac with a broken screen, so purchased the mini DVI to DVI lead and an external monitor.

    Having hooked it up I notice that the refresh rate that I am getting on the external monitor just isn't hight enough, the image isn't anywhere near as sharp as it was on the iMacs own screen.

    Now I can fiddle about with the resolution but I dont seem to be able to change the refresh rates

    I am running an X1600 graphics card in the machine and assumed it would be ok to run at 75mhz..

    External monitor I am using is this one Benq G2222HDL 21.5" LED Monitor |

    Any help appreciated


  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    I am running an X1600 graphics card in the machine and assumed it would be ok to run at 75mhz..
    I think you meant running it at 75Hz not MHz. Changing the refresh rate of the monitor will depend on what rates are available in System Preferences, Displays. Most likely the refresh rates that are not supported by that monitor will be grayed out. For example: My Samsung SyncMaster can only be set at 60Hz as other rates are not supported.

  3. #3

    Member Since
    Apr 12, 2008
    Hi, yes Hz, not Mhz

    However, within the Displays options there are no refresh rates to choose from, only resolutions, the refresh rates aren't greyed out, they are just not displayed anywhere at all

  4. #4

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Texas, where else?
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    It likely is already using the proper refresh rate. You might try DisplayConfigX or SwitchResX.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

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