Hey all! Thought I would share my experiences here. Last week, I updated my 2017 iMac to Big Sur and immediately lost the ability to use my external display monitor. I tried several work arounds, but the best I have found is by connecting my monitor to my external eGPU instead of connecting it to my computer. Works great. I know not everyone has one, but if you do you might want to just go that route.
elizabethsaint
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