Mac mini M1 - green/pink screen artifacts at 3440x1440

[CtotheP]

Anyone know why this CONSTANTLY happens on a Mac mini M1? Connected to an LG 34UC80-b at 3440x1440. Connection is HDMI to HDMI, I've also tried USB-c to DisplayPort, etc. I get constant pink/green artifacts all over the screen

Thoughts?

 

[Chuckeee]

Is it present in native resolution? Screen scaling of 1:1. Wondering if it’s an aliasing artifact.

 

[HDFan]

I get constant pink/green artifacts all over the screen

The image just looks like a pink green screen saver. Is all of that color the artifacts?

 

[meson]

You get the artifacts when using usb c to DisplayPort as well?

Are you connecting directly to the ports on the mini or using a hub?

If it were HDMI only, I would say it's a handshake issue with HDMI and recommend trying a different cable or adapter/hub. I've had issues with my M1 Macs and some usb c to HDMI dongles. I've never had an issue using DisplayPort via usb c or a dongle/hub.

If you are having problems with DisplayPort as well, I'm not sure what to recommend other than trying a variety of cables, dongles, or hubs in hope that you find one that works. However, before spending money to play connection roulette, I would consider wiping the mini, doing a fresh install of MacOS and manually download and configure all software and settings to avoid bringing back a corrupted file from a restore.

 

[CtotheP]

Happens on both hdmi and usbc to displayport. No docks involved.

 

[meson]

Try restarting in safe mode.

Safe Mode Instructions

If that helps, something you have installed is causing issues.

You can try reinstalling macOS again.

However, the fact that it is happening on both display protocols may well be indicative of a logic board problem. Check in with Apple support either by a call or trip to the Genius Bar at a store.

 

[CtotheP]

Thanks all for the suggestion. Created a fresh, bootable Sonoma installer and wiped my Mac mini drive w/ Disk Utility to do a clean install. Need to troubleshoot a bit as Disk Utility appeared to NOT have wiped the full drive and I'm in limbo a bit. I'll be back and report out once I get Sonoma installed

 

[CtotheP]

Finally got the SSD straightened out with Apple Configurator 2 and was able to clean install MacOS Sonoma. As of now screen looks really good! A few subtle pixel issues here-and-there but assuming that's due to the non-native resolution of 3440x1440