rMBP External Monitors not working....

Discussion in 'MacBook Pro' started by SpitUK, Sep 28, 2012.

  1. SpitUK macrumors 6502

    Mar 5, 2010
    Hi Guys, having a frustrating problem. I connect 2x 27" 2560x1440 Hazro monitors via 2 USB Dual Link DVI to Mini DisplayPort Adapters. They were working fine but have now stopped! The monitors display a blank screen, the Mac clearly switches to the external displays, the displays appear in the preferences and I can move them around, the mouse pointer disappears off the side as though going to the extra space. Just NO picture!

    I have tried connecting a MacBook Air and that works so I know the monitors and adapters are fine. I have shut down the Mac and rebooted, with and without the cables attached. I removed GFXCardStatus to no effect.

    Anything else I can try?

    I did install Steam in between using the external monitors but I cant see how that would cause an issue.

    Do you think the Thunderbolt ports could have blown?
  2. SpitUK thread starter macrumors 6502

    Mar 5, 2010
    Fixed it!!! I pressed gather windows and it brought the external displays preferences to the rMBP display and I discovered that the external monitors had reverted to a different res! I selected the correct res and the picture came on :)

    The reason the picture didnt display with a different resolution was the monitors are cheap versions that dont include any scaling so will only display the 2560x1440 res.
  3. rrm998 macrumors regular


    Jun 15, 2012
    Houston, TX USA
    Good catch! Something to keep in mind when I'm using my non-Thunderbolt monitor.

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