Extended display problem

Discussion in 'iMac' started by bigshot82, Nov 23, 2012.

  1. bigshot82 macrumors newbie

    Joined:
    Apr 12, 2011
    #1
    I connected my imac 21" to an external 20" monitor via Minidisplayport-to-VGA adapter. Picture quality is not good; I see dim vertical lines on the screen. Resolution is set to monitor's native resolution.
    Any idea how to fix this?
     
  2. Apple fanboy macrumors Penryn

    Apple fanboy

    Joined:
    Feb 21, 2012
    Location:
    Behind the Lens, UK
    #2
    Try a different cable, and make sure the plugs are pushed into the socket fully.
     

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