Display Turning off and on when I connect my Macbook Air M4 to Monitor with HDMI cable

When I connect my Macbook Air M4 to my ASUS VG27AQM5a monitor with Paugge USB-C to HDMI cable which support HDMI 2.1, display turn off and on randomly, I can't use DP cable because this monitor also connected to my PC. I'm using macbook as clamshell mode and my monitor as 120Hz. Thought it can be fix If I lower Refresh rate from 300Hz to 120Hz, it may be not happen but still happens, monitor blacks out for 2-3 second then display is coming back.

Posted on Feb 19, 2026 7:11 AM

Top-ranking reply

Servant of Cats

Level 8

37,499 points

Posted on Feb 19, 2026 2:16 PM

You could try lowering the refresh rate to 60 Hz. (That is the refresh rate mentioned in Apple’s Technical Specifications.)

If the Mac is willing to drive the display at a refresh rate of 120 Hz, it may be that there are display transmission errors. Recent versions of macOS do not want to see these, and may intentionally cut signal when they do. So a cable that is not of high enough quality, or that is too long, can trigger the symptom.

View in context

Display Turning off and on when I connect my Macbook Air M4 to Monitor with HDMI cable

Similar questions