Mac mini M4 pro monitor connection issue after sleep mode.

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Level 1

4 points

Mac mini M4 pro monitor connection issue after sleep mode.

I have a Mac mini M4 Pro and it was connected to 3 monitors. When this Mac goes into sleep mode, it often only recognises 2 monitors. Then I had to unplug and replug the monitors, change the display settings, and then I was able to use 3 monitors again.

But since it went into sleep mode last time, I cannot use the third monitor anymore. It only recognises 2 monitors and it is no longer connected to the third monitor.

How can I fix this?

Mac mini, macOS 26.1

Posted on Nov 30, 2025 12:24 AM

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Answer 1

Top-ranking reply

azaksalmarzur28

Level 2

426 points

Nov 30, 2025 1:51 AM in response to jay_in_mel

Your Mac mini M4 Pro is losing EDID recognition for the 3rd monitor after sleep.

Try power-cycling the monitor, switching Thunderbolt ports, and resetting display services. If that fails, delete display preference files or change cables/connection types. This is a known sleep-related bug in macOS 26.x, and changing ports/cables or resetting display configs usually fixes it.

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Answer 2

jay_in_mel Author

Level 1

4 points

Nov 30, 2025 2:37 AM in response to azaksalmarzur28

Thank you very much.

I have fixed it after deleting display preference file.

For other people, I deleted 'com.apple.windowserver.plst' in '/Library/Preferences/' and restarted.

It works again!!

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