HDMI Not working with External Display on MacOS

nates8 · 07-22-2025, 08:58 PM

I own a StarTech DK30CH2DPPD and I have never had the HDMI connection work on MacOS with an external display.

I've owned this dock for a few years now and gave up trying to get the HDMI connection to work. I switched to using a video display cable which worked.

However things have changed and I need the HDMI cable to work. I'm running MacOS 15.5 but have tried and failed to get an HDMI monitor to work on older MacOS versions as well.

Interestingly, when I plug the HDMI cable into the dock from one of the monitors i've tried, the screen will go from "No input detected" to just a black screen so it seems there might be some communication between the dock and the display? In my MacOS settings though no external display is picked up.

I've verified the cable is good and the monitor is functioning. I've tried to re-install the driver and the DisplayLink Manager app to no avail.

Any other ideas why Video connection works but HDMI doesn't?

07-22-2025, 08:58 PM	#1
nates8 Junior Member Join Date: Jul 2025 Posts: 1	HDMI Not working with External Display on MacOS I own a StarTech DK30CH2DPPD and I have never had the HDMI connection work on MacOS with an external display. I've owned this dock for a few years now and gave up trying to get the HDMI connection to work. I switched to using a video display cable which worked. However things have changed and I need the HDMI cable to work. I'm running MacOS 15.5 but have tried and failed to get an HDMI monitor to work on older MacOS versions as well. Interestingly, when I plug the HDMI cable into the dock from one of the monitors i've tried, the screen will go from "No input detected" to just a black screen so it seems there might be some communication between the dock and the display? In my MacOS settings though no external display is picked up. I've verified the cable is good and the monitor is functioning. I've tried to re-install the driver and the DisplayLink Manager app to no avail. Any other ideas why Video connection works but HDMI doesn't?