Macbook Pro M3 Pro stops detecting external display after sleep

Question

Level 1

4 points

Macbook Pro M3 Pro stops detecting external display after sleep

Recently I have upgraded from a Macbook M1 Pro to a MacBook Pro M3 Pro 14". I have been using my Macbook with the same Lenovo Y34WZ-30 monitor using a USB-C cable. I have come upon some very strange behavior however. When connecting my Macbook to the monitor using the USB-C cable, it works completely fine. When my MacBook goes to sleep and wakes up again, the external display does not light up. It also does not show up anymore under display settings. The peripherals connected to the monitor (mouse and keyboard) do still work. The only way for the external display to show up working again is by either restarting my Macbook or hard resetting the monitor by pulling out the power cable and plugging it in again. This behavior is not present on my old MacBook Pro M1, and also not on a MacBook Air M2. Trying a different USB-C port also does not change the behavior. I've had this issue on MacOS 15 as well as the new version 26. Anyone knows what I could try?

MacBook Pro 14″, macOS 26.0

Posted on Sep 19, 2025 02:17 AM

Reply

Answer 1

steve626

Level 6

13,197 points

Sep 19, 2025 10:31 AM in response to BW7a

BW7a wrote:

Recently I have upgraded from a Macbook M1 Pro to a MacBook Pro M3 Pro 14".

The M3 MacBook Pro was discontinued a year ago. Did you obtain yours in NEW condition from an authorized Apple seller?

If it was not factory fresh brand new, did you follow these steps to prepare it before using it? To completely remove any vestige from the previous owner?

What to do before you sell, give away, trade in, or recycle your Mac - Apple Support

Are the Macs that do work properly with the monitor (M1, M2 Macs) also running Sequoia and/or Tahoe? If so, I would be suspicious of the M3 Mac. You might want to try a different cable connection type also.

Reply