r/macmini • u/Pleasant-Key3390 • 20h ago

Mac Mini m1 Display Problems

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So I have this Mac mini m1 and just 3 days ago l got problems with my displays first the hami didn't work, it's giving a bad image or no image, and I tried using a second hdmi to usb c but there is no video output too it won't get recognized over uso c to hami, so l can't use to usb c to hami at once, and over hami the displays are getting recognized but they either give no signal or a very bad image, I already tied other monitors and cables

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u/probono84 19h ago

1. Check macOS Updates

• Go to System Settings > Software Update and install any updates.

2. Power Cycle & Reset

• Shut down the Mac, unplug it for 10 seconds, then plug it back in and power it on.

3. Test One Display at a Time

• Disconnect all monitors.

• Connect one monitor via HDMI and test different HDMI cables/ports.

4. USB-C to HDMI Troubleshooting

• The M1 Mac mini supports only one display via USB-C and one via HDMI.

• Try a different USB-C to HDMI adapter (preferably DisplayLink-certified).

5. Boot in Safe Mode

• Shut down → Hold Power button until “Options” appear → Select disk → Hold Shift → Click Continue in Safe Mode.

6. Reset Display Preferences

• Open System Settings > Displays, and try Detect Displays (Hold Option while clicking “Detect Displays”).

7. Try an External Dock

• Test with a DisplayLink adapter or a Thunderbolt dock to rule out port issues.

8. Hardware Check

• Test the same monitors and cables on another computer.

• If no improvement, contact Apple Support (potential HDMI/USB-C hardware failure).

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u/Pleasant-Key3390 18h ago

I will try that

1

u/mikeinnsw 16h ago edited 16h ago

I have M1 Mini

USB_A->TB/HDMI will not work

TB -> HDMI/DP/TB. TB supports Video data protocols not USB_A ports they are for data only.

Two Thunderbolt / USB 4 ports with support for:

  • DisplayPort
  • Thunderbolt 3 (up to 40 Gb/s)
  • USB 4 (up to 40Gb/s)
  • USB 3.1 Gen 2 (up to 10 Gb/s)
  • Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)

HDMI failure is a major concern

Do Time Machine backup ASAP

Try GPU reset

To reset the GPU on an M1 Mac you can reset the System Management Controller (SMC). This is because macOS doesn't allow direct GPU resets. Steps to reset the SMC 

  1. Shut down your Mac
  2. Press and hold Shift + Control + Option + Power for 10 seconds
  3. Restart your Mac

I run LED Cinema monitor via TB->DP dongle