MacBook Pro 2022 (M2 chip) not detecting Dell u2424he monitor through HDMI or USB-C connection

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MacBook Pro 2022 (M2 chip) not detecting Dell u2424he monitor through HDMI or USB-C connection

My Macbook Pro 2022 (M2 chip) is not accepting hdmi pr USB-C connection with an adapter through a dell u2424he monitor It was connected before and has worked in the past 6 months but not working anymore. My MacBook Pro 2022 (M2 Chip) is not detecting that I have plugged in an external display( A Dell u2424he monitor) through an adapter from my Mac. I have tried HDMI and USB-C connection from the Mac but still doesn’t work. Both of these methods worked 6 months ago but are no longer working. What should I do ?

[Edited by Moderator]

MacBook Pro 13″, macOS 15.5

Posted on Jul 16, 2025 04:38 AM

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Answer 1

Top-ranking reply

Grant Bennet-Alder

Level 10

138,809 points

Jul 16, 2025 06:42 AM in response to SmallT06

The Mac does not rely on Windows-like side-loaded "Drivers" which are actually packages of resolutions and settings for a specific display. Instead, it goes straight to the immutable source -- it asks the display itself.

To get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display. "No signal detected" is generated by the DISPLAY, not by the Mac.

This query is only sent at certain times:

• at startup

• at wake from sleep — so momentarily sleeping and waking your Mac may work

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• hold the Option key while you click on the (Detect Display) button that will appear in Displays preferences (from another display)

so try doing some of those things and see if the display comes alive.

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