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I am trying to connect my home screen via HDMI using a dock. It shows the monitor in the Displays tab in settings but I keep having a black screen on the external monitor. I also have a Dell laptop and it works fine on it, both through the dock and directly plugged on my Dell.

I tried many things. Changing the resolution of the mac, restarting it, unplugging all cables except for the HDMI. Switching the USB-C ports that my dock is connected through etc.

It also works fine at my workplace (which I can connect directly on the mac). I don't know what else I can try.

My monitor is a AOC Q27G2G4 that I bought 2-3 years ago.

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  • Can you connect directly from the Mac to the monitor (no dock)?
    – Allan
    Commented Jan 20 at 15:54
  • No @Allan, my monitor uses HDMI and my Mac has USB-C ports only.
    – Jules
    Commented Jan 21 at 14:27
  • USB-C to HDMI active adapters are not overly expensive; we need to eliminate the dock from the equation so to narrow down the cause of the problem
    – Allan
    Commented Jan 21 at 16:25
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    What brand/model of USBC dock are you using? It may well be incompatible. I've tested several USBC docks/hubs over the past few years for our classrooms, and they are not all created equal, even the one's marked macOS Compatible.
    – IconDaemon
    Commented Jan 21 at 18:13

1 Answer 1

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I had this same issue with the same exact monitor. The issue is the refresh rate your Mac is set to use for that monitor is too high. On your Mac go into the Settings > Display > Click on that AOC monitor > Change Refresh rate to 60 Hertz, that should work.

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