External Monitor not recognised by Monterey

My external monitor which has worked fine for over a year under OS 10.12 will now not connect under OS 12,2. I have reset NVRAM as SMC but to no avail.

Any suggestions?

Posted on Feb 23, 2022 6:10 AM

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lllaass

Level 10

210,513 points

Posted on Feb 23, 2022 6:51 AM

Update to 12.2.1 that was released 2/10 if not already there.

How is the monitor connected to the Mac?

Have you tried different ports on the Mac?

Is it connected via a hub?

Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.

How to use safe mode on your Mac - Apple Support

A lot of times just boot to Safe Mode followed by normal boot resolves problems.

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2 replies

Top-ranking reply

lllaass

Level 10

210,513 points

Feb 23, 2022 6:51 AM in response to moirafromcork

Update to 12.2.1 that was released 2/10 if not already there.

How is the monitor connected to the Mac?

Have you tried different ports on the Mac?

Is it connected via a hub?

Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.

How to use safe mode on your Mac - Apple Support

A lot of times just boot to Safe Mode followed by normal boot resolves problems.

Feb 24, 2022 1:14 PM in response to lllaass

Yes I tried both - but what actually worked (and I swear it was the first thing I had tried) was using a different HDMI to USB-C cable.

For anyone else having these problems, I am connecting directly into the iMac via a built-in USB-C port.

Problem now sorted

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External Monitor not recognised by Monterey