External Monitor Issue After macOS Sequoia 15.1.1 Update
Hi everyone,
After updating my MacBook Air M2 to macOS Sequoia 15.1.1, I’ve encountered an issue with my external monitor. I connect my ViewSonic monitor via an HDMI-to-Type-C cable. The monitor works for about 5 seconds after being connected, then the screen goes black.
Interestingly, the monitor is still detected in the display settings, and I can even move the cursor into the display area—but nothing is visible on the screen.
Here’s what I’ve tried so far without success:
- Adjusting the resolution and refresh rate.
- Booting in Safe Mode.
- Resetting display profiles.
- Rebooting the system.
To rule out hardware issues, I tested the same setup on my MacBook Air M1. Before the update to macOS Sequoia 15.1.1, it worked perfectly. After updating, the same problem occurred.
However, I tried connecting to a Samsung external monitor, and that worked fine.
Has anyone else faced similar issues or found a solution? I’d appreciate any guidance or suggestions.
Thanks!
MacBook Air, macOS 15.1
