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Gibson88
User level: Level 1 (10 points)

Mac Mini M6, no display.

Does anyone have issues with Mac Mini M6 not waking monitor?


I’ve had the same monitor and thundebolt cable that I used with my M4 Mac Mini, but on my new M6 quite often when I wake my Mac from sleep, or restart I can see the Mac is active but my monitor says no input detected. If I unplug and reconnect the thunderbolt cable, assuming a software issue but wanted to know if anyone else had any advice?

Posted on Oct 26, 2026 2:50 PM

3 replies

Ian R. Brown
User level: Level 7 (25,870 points)

Oct 27, 2026 3:44 AM in response to Gibson88

Please accept my apologies for giving you an AI response but I find them helpful. This is what came up when putting your question into the Safari browser:-


Yes, monitor wake-from-sleep and handshake issues are a common report across various Apple Silicon Mac mini generations, including newer models. Even when using the same cable and monitor that worked on an older Mac mini, subtle changes in how the newer chip negotiates DisplayPort/Thunderbolt video handshakes, low-power states, or refresh rates can cause a "no input detected" state upon waking. [1, 2, 3]

Troubleshooting Steps to Try

  • Power-cycle the monitor: Disconnect the power cord and the video cable from the monitor itself for a minute to completely reset its internal scaler and input board. [1]

  • Test the handshake settings: Go to System Settings > Displays, hold the Option key, and click Detect Displays. [1]

  • Adjust high-refresh-rate or HDR settings: If your monitor supports high refresh rates (120Hz+) or VRR/Adaptive Sync, temporarily test it locked at 60Hz or turn off HDR to see if the high-bandwidth signal path is causing the drop-out. [1]

  • Change power/sleep behavior: Some users find relief by adjusting energy settings, such as disabling deep sleep/eco modes on the monitor or tweaking macOS sleep-prevention settings. [1]

  • Try an alternate connection path: If you are using Thunderbolt/USB-C, test whether a direct USB-C to HDMI adapter or a certified replacement cable changes the behavior. [1, 2]

Tips

  • Refresh rate drop: Lowering your display refresh rate to 60Hz often cures stubborn wake failures caused by signal-handshake timing.

  • Power cycle first: Always hard-power-cycle the monitor itself before blaming the macOS build, as displays frequently lock up their input processors.


den.thed
User level: Level 10 (99,154 points)

Oct 27, 2026 7:53 AM in response to Gibson88

What make and model is the Display...?

What TB/USB-C cable and how long is it...?


If none of Ian's suggesttitions pan out.

1) Test different ports on the back of the Mac mini.

2) Test a short 3.3'/1m TB/USB-C cable with a higher rating.

3) Test a short high speed HDMI 2.2 cable if the display supports HDMI.

VikingOSX
User level: Level 10 (131,878 points)

Oct 27, 2026 7:42 AM in response to Gibson88

If I were to purchase an M6 mini, I would reuse the high-end Belkin HDMI cable currently in use on my M4 Mac Mini Pro that is connected to my LG 32-in 4K display and which I purchased in 2020 for my M1 Mac mini.


I have never had the wake up problem you describe on M1, M2, and now M4 Mac minis with this LG display and its connectivity. Currently on macOS 27.2.

Originally posted at discussions.apple.com/thread/256383557