I am experiencing an issue with my MacBook Air M1 (2020, Sonoma 14.3) and Dell monitor (model P3221D), which supports USB-C. Until recently, I used the Dell monitor as my primary display without any problems. The monitor was also powering the MacBook through its USB-C connection. It worked out fine for more than 6 months.
However, suddenly, the MacBook stopped mirroring its display to the Dell monitor. The MacBook itself is functioning normally, and it still indicates that it is charging when connected to the monitor.
Despite this, the image from the MacBook is no longer appearing on the Dell monitor. Additionally, while the MacBook acknowledges it’s being charged through the monitor, it doesn’t recognize the monitor in the display settings as an external screen.
The Dell monitor displays a message stating that the USB-C connection is not identified:
“No USB-c signal from your device”.
I have tried:
- reconnecting the cables,
- turning off the macbook air
- upgrading macbook air to the latest version, Sonoma 14.3
- and using different ports on the mac, the monitor only has 1 USB-c. Unfortunately, the issue persists.
- I also tried a different USB-c cable. But, the same persists
Could anyone provide suggestions on how to diagnose and resolve this problem?