DP TX wrote:
My monitor started an odd flicker and ghosting of images almost immediately (less than 5 minutes) after performing macOS 15.1 update. Monitor is connected via HDMI and has not had this problem with any monitor in the past.
Also using a Mac Mini M2 updated to Sequoia 15.1
The External Display is Directly Connected via a HDMI cable from Display to female HDMI connector of the computer
Sometimes when connecting a USB-C Drive to the computer
I have inadvertently touched or nudged the HDMI Cable for the Display
You may consider Reseating the Display Cable on the computer
An aside to to your actual issue
The Apple Support Community Forums are sometimes visited by AI / LMM / ChatBots.
AI / LLM are basically a Super Version of Predictive Text which is based upon a Data Set.
When that Data Set is based upon older data points, the outcome of the response will be equally out dated and / or unreliable
Suggest being very careful about this.
Some suggestions can be incorrect, misinformed , incomplete, impossible to do, out right wrong.
If your machine is an Apple Silicon M1,M2,M3 computer
Resetting the SMC and Or NVRAM does not apply at all