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I have an M1 Mac Mini with Big Sur 11.4 and yesterday the external monitor started flashing white then red, green, blue, black when the computer goes to sleep. i.e. the whole screen is white, then red etc. I have restarted the machine, unplugged the monitor and disconnected the HDMI cable but it is still the same. Any ideas?
What external display/monitor?
What HDMI cable?
Try a different Premium Certified HDMI cable.
What external display/monitor?
What HDMI cable?
Try a different Premium Certified HDMI cable.
Disable Sleep by checking "Prevent...". Not needed on the M1.
Thanks for the tip - turns out it was the monitor!
You're welcome. Thanks for the update, sorry about the display/monitor.
External monitor flashes blue green red black while on standby
