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I have an adapter which provides a display port and some USB ports from my Mac. If I plug in an external monitor to the adapter's HDMI port, often the monitor is not found. But if I simply disconnect the adapter from the power and reconnect it, it works.
[Re-Titled by Moderator]
MacBook Pro 13″, macOS 10.15
Hi Bappoo,
Are you able to use the adapter with a different computer to see if you get the same results? This will help narrow down if the adapter or your computer is causing the issue. Here is some information to keep in mind as well when troubleshooting:
Disconnect the cable from your external display from your Mac, then reconnect it. If the cable from your external display doesn't connect to the ports on your Mac, you can use a USB-C or Thunderbolt adapter. If you're using a USB-C or Thunderbolt adapter to connect a display, the adapter must be compliant with DisplayPort Alt Mode or Thunderbolt / USB 4.
You can actually find this information in its full context here: If your external display isn't detected or appears blurry when connected to your Mac - Apple Support
We hope this helps.
Take care.
Thanks for the response. Actually my comment was meant to be a possible solution for the OP, not a report of an issue. For me it's fine to just unpower and then power the adapter to solve the issue.
unplug/replug Display adapter works for me to allow 'missing' display to appear
