mac m1 pro 16" stop accepting 2 externals displays after Tahoe update.

Hey everyone, I've got a dual monitor setup: one 30-inch and one 24-inch external display.

After updating to Tahoe, both monitors worked perfectly for about two days. Then, the 30-inch monitor suddenly stopped working, just a black screen.

Here's the strange part: If I disconnect the 24-inch monitor, the 30-inch works perfectly. But as soon as I plug the 24-inch back in, the 30-inch goes dark again.

I sometimes get this notification: "accessory not enabled usb type-c digital av adapter connect the accesory to a deisplay port capable cable."

I tried switching my original USB-C to HDMI cable for a different HDMI-to-HDMI cable, I changed the connection order, and I reset my Mac, but nothing has fixed it(but still work any cable if only one is connected)

Has anyone else run into this with issue?

TL;DR: Mac stopped recognizing my second monitor after updating to Tahoe. If I disconnect one monitor, the other works fine, but I can't run both at the same time anymore. I didn't have this problem before the update.


MacBook Pro (2021)

Posted on Oct 9, 2025 10:14 AM

Reply
Question marked as Top-ranking reply

Posted on Oct 9, 2025 10:41 AM

thanks for the answer, i have fixed with this:


# Remove global WindowServer preferences

sudo rm -f /Library/Preferences/com.apple.windowserver*.plist


# Remove WindowServer cache/database

sudo rm -rf /private/var/db/WindowServer


# Remove user-specific display profiles

rm -f ~/Library/Preferences/ByHost/com.apple.windowserver.displays*.plist 2>/dev/null


# Remove ColorSync profiles linked to displays

sudo rm -rf ~/Library/ColorSync/Profiles/ByHost

sudo rm -rf /Library/ColorSync/Profiles/Displays 2>/dev/null


# Restart display services (this will log you out)

sudo killall -HUP WindowServer


this kill your desktop for a seconds and erase the desktop arrange, fixing it for me.

3 replies
Question marked as Top-ranking reply

Oct 9, 2025 10:41 AM in response to neuroanatomist

thanks for the answer, i have fixed with this:


# Remove global WindowServer preferences

sudo rm -f /Library/Preferences/com.apple.windowserver*.plist


# Remove WindowServer cache/database

sudo rm -rf /private/var/db/WindowServer


# Remove user-specific display profiles

rm -f ~/Library/Preferences/ByHost/com.apple.windowserver.displays*.plist 2>/dev/null


# Remove ColorSync profiles linked to displays

sudo rm -rf ~/Library/ColorSync/Profiles/ByHost

sudo rm -rf /Library/ColorSync/Profiles/Displays 2>/dev/null


# Restart display services (this will log you out)

sudo killall -HUP WindowServer


this kill your desktop for a seconds and erase the desktop arrange, fixing it for me.

mac m1 pro 16" stop accepting 2 externals displays after Tahoe update.

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