In an internal note this week, obtained by MacRumors, Apple informed service providers that it is aware of and is investigating an issue that may result in the appearance of “pink squares or pixels” on displays connected to a Mac mini M1.
This issue has been reported by users in the Apple support communities, MacRumors forums, and Reddit since the M1 Mac mini was released in November, but the exact cause is unclear. Based on feedback from affected users, it appears that the problem may be more common when connecting displays via HDMI compared to Thunderbolt.
Apple didn’t provide a specific timeframe for a fix. The memo was issued on February 19, more than a week after the release of macOS Big Sur 11.2.1, which does not appear to address the issue. A fix may be ready in time for the release of macOS Big Sur 11.3, which has been in beta testing since February 2.
Meanwhile, Apple outlined the following troubleshooting steps:
- Put the Mac mini to sleep
- Wait two minutes and activate the Mac mini
- Unplug the display from the Mac mini, and then reconnect the display
- Adjust the screen resolution in System Preferences> Displays
If the problem reoccurs after restarting your Mac mini, Apple says to repeat the steps above.
There have been several other external display problems with the Mac M1s in recent months, ranging from USB-C connection problems to some resolutions not being available when using an ultra-wide or super-ultra-wide screen.