External monitor set-up woes

Discussion in 'MacBook Air' started by molesworth_2, Aug 19, 2015.

  1. molesworth_2 macrumors newbie

    Aug 19, 2015
    I'm trying to set up a Dell UltraSharp U2415 as an external monitor for my macbook air, and they don't seem to want to talk to each other. The monitor came with a mini DP cable, which I assume (possibly wrongly) goes into the airbook thunderbolt port (hey, it fits), and a USB cable. I've tried using both cables, and just the mini DP, and neither way seems to work. Dell support is no help, and I'm frankly surprised I'm not finding any current useful advice on the web. Please let me know where I'm going wrong; if I can't get this working I'll have to try to fit this monitor back in the box to send it back, and no one wants to see me try to do that.

    Thanks in advance,
    n. molesworth
  2. motrek macrumors 68020

    Sep 14, 2012
    Ignore anything to do with USB for now. The video signal doesn't go over USB.

    The mini-DisplayPort cable will work.

    Did you set the monitor to the mini-DP input?
  3. Carlanga macrumors 604


    Nov 5, 2009
    I have my MBA connected to my monitor via miniDP to HDMI belkin cable.
    Are you sure the other side of that cable is USB and not something else? What ports does the monitor have?
  4. motrek macrumors 68020

    Sep 14, 2012
    USB is irrelevant to the conversation for now.

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