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external monitor intermittently black

I have a 2017 iMac Pro running Ventura. I have attached two different 4k LG monitors, one at a time, and both exhibit the same behavior. They intermittently go black for a second or two, then come back on. They do this every few minutes. They are attached to a lightning port via an HDMI dongle. I have swapped out the HDMI cable and the power cable for the monitors. Both monitors work without a problem on a Dell computer. Any ideas?

iMac Pro, macOS 13.0

Posted on Nov 27, 2022 1:23 PM

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Question marked as Top-ranking reply

Posted on Nov 28, 2022 8:20 AM

What USB-C to HDMI adapter do you have?


About the Apple USB-C Digital AV Multiport Adapter - Apple Support


Belkin USB-C to HDMI Adapter -Apple


Some after market USB-C to HDMI adapters will work and some will not.


For more info, see > Connect an external display to your iMac - Apple Support

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external monitor intermittently black

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