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User profile for user: sykes1987
sykes1987 Author
User level: Level 1
4 points

My LG monitor is connected to my iMac but it cannot be detected.

I have an iMac (Retina 4K, 21.5-inch, 2017) and I am trying to connect an external 4k LG monitor 24UD58.


It is connected via a USB C to HDMI adaptor (the apple one).


No matter what I try the iMac doesn't detect the monitor. I have tried restarting with all connected, powering up and connecting etc etc. I have tried detect displays but nothing is found.


I have tried all cables and monitor with my MacBook Pro and it works with no issues so I know the issue if coming from my iMac, anyone else had this issue and know a fix?


Posted on Feb 2, 2021 1:04 AM

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User profile for user: Jack-19
Jack-19
User level: Level 8
45,824 points

Posted on Feb 2, 2021 1:08 AM

Hi there,


Let’s go through this guide, Get help with video issues on external displays connected to your Mac - Apple Support, and make sure all is good there.


Next, reset the PRAM: Reset NVRAM or PRAM on your Mac - Apple Support

And the SMC: How to reset the SMC of your Mac - Apple Support


Cheers,


Jack

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My LG monitor is connected to my iMac but it cannot be detected.

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