MacBook Pro M4 is not connecting to external monitor after upgrading to Tahoe

Question

Level 1

4 points

MacBook Pro M4 is not connecting to external monitor after upgrading to Tahoe

After upgrading to macOS Tahoe 26.0, my MacBook Pro M4 is no longer connecting to my external monitor via USB-C. Previously, it was very convenient to charge and mirror the screen using just one cable. I can use an HDMI cable, but the experience is much worse, as I now need two cables - for charging and for display output.

I’ve tried different ports, using the “Detect Displays” button, and re-plugging the cable. Nothing works. This is definitely a regression. I’ve tested this cable with another laptop, and it works fine there. It also worked perfectly before I upgraded to Tahoe, so please don’t suggest buying a new cable.

[Re-Titled by Moderator]

Original Title: MacBook is not connecting to external monitor

MacBook Pro 14″, macOS 26.0

Posted on Sep 23, 2025 11:05 AM

Reply

Answer 1

leroydouglas

Level 10

199,632 points

Sep 23, 2025 11:19 AM in response to Mitaxe

Mitaxe wrote:

After upgrading to macOS Tahoe 26.0, my MacBook Pro M4 is no longer connecting to my external monitor via USB-C. Previously, it was very convenient to charge and mirror the screen using just one cable.

I can use an HDMI cable, but the experience is much worse,

I now need two cables - for charging and for display output.

[Re-Titled by Moderator]

Original Title: MacBook is not connecting to external monitor

Ok Mitaxe — the game keeps changing yes.

you can submit your Apple Feedback here: Product Feedback - Apple

The new macOS are increasingly fussy over sub-par cables for connecting external display.

Using high quality cables (certified ULTRA HDMI cables or PREMIUM ≤ 1.0 m length, USB-C cables rated for high-speed data is known to resolve the issue.

Best results the shorter the cable the better for Thunderbolt5 cables ≤ 0.5 m length

Get help with video issues on external displays connected to your Mac - Apple Support  If your external display is dark or low resolution - Apple Support

Use multiple displays with your Mac

Connect one or more external displays with your Mac - Apple Support

Using 4K displays, 5K displays, and Ultra HD TVs with your Mac - Apple Support  Connect a display to your Mac - Apple Support

Reply