Dell 27" 4k P2715Q Monitor - No DP Signal?

Discussion in 'Mac Accessories' started by Molson1020, Oct 1, 2018.

  1. Molson1020 macrumors regular

    Feb 3, 2009
    So I've had this monitor for a few years now, and it's always worked great. Recently though it won't connect to my MacBook Pros (personal one and my work one) using the DisplayPart to MiniDP cable. I even tried buying a new one and still no luck.

    It connects via HDMI, but only at 30Mhz. Anyone know what might be causing this issue?

  2. Molson1020 thread starter macrumors regular

    Feb 3, 2009
    Replying to my own thread.

    After a week of searching for answers, I found a solution! For whatever reason, my MacBook Pro won't detect a Displayport Cable, but has no problem with an HDMI cable. Only problem is HDMI goes through at 30hz.

    I purchased an HDMI -> Mini Display Port adapter that can handle 4k at 60hz and it's working great now.

    Just incase anyone else has the same problem.
  3. Fishrrman macrumors P6


    Feb 20, 2009
    An important question:
    What YEAR is the MacBook Pro?

    Some USB-c to displayport cables will work with 2016 MBP's, but WILL NOT WORK with 2017/18 models.
    Depends on the cable.

    The way to overcome this is to use a "known good" cable that DOES work with 2017/18 models...
  4. Molson1020 thread starter macrumors regular

    Feb 3, 2009
    I am actually on a 2015 MacBook Pro, so I needed a HDMI -> Thunderbolt/MiniDP adapter.

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3 October 1, 2018