Extended display problem

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

  1. bigshot82 macrumors newbie

    Apr 12, 2011
    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

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

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