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