Imac 27" 5K 2017 not showing external display

Soham Shivanand Swami

macrumors newbie
Original poster
Jan 25, 2020
Hi there I have been using my LG 27 inch 4K-UHD 27UK650 as external monitor for iMac 5k for past 1.5yrs. But now it is not showing the monitor connected.

From past one week I have been searching fix to this problem, I have found that monitor is working
well and is been detected by LG that it is connected to Imac

I think the only problem faced is of some software issues with iMac.

Please tell me the fix ASAP
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