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Dell Display Manager Mac OS Version Does Not Work When Connected to HDMI or DP of the Monitor

Summary: This article provides information about the Dell Display Manager failing to detect the monitor.

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Dell Display Manager Cannot Detect the Monitor


The Dell Display Manager (DDM) fails to detect the monitor when launched. The DDM icon sitting on the status bar shows up with an exclamation mark.

User setup falls into one of the following matrices:

  1. Mac computer is connected to the monitor over High-Definition Multimedia Interface (HDMI) port.
  2. The user is using DA300, DA310, or WD19TB dock to connect the computer to the monitor’s HDMI or DisplayPort (DP).

Affected systems

  • MacBook Pro 2018, 2019 and 2020
  • MacBook Air 2018, 2019 and 2020
  • Mac mini 2018
  • Mac Pro 2019

Supported Mac Operating System Versions:

  • Mac operating system 10.14 or later

Refer to What is Dell Display Manager? To get the updated models supported by the DDM Mac operating system version.

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Root Cause

The Video port from the Mac computer to the monitor is not complying with the HDMI standards.

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Alternate solution

  1. Switch to a different connectivity matrix:
    • Use Thunderbolt (TB) cable to connect the computers to the monitors that support TB.
    • Use a USB Type-C cable to connect the computer to the monitor that is supporting video and data signal over USB Type-C connection.
    • Connect the HDMI and USB upstream cable from the computer to the monitor.
    • Connect the DP and USB upstream cable from the computer to the monitor.
  2. Launch DDM.

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Article Properties

Last Published Date

17 Sep 2021



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