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Question: imac external monitor stopped working

Ever since my upgrade to High Sierra my external Samsung monitor stopped working

It's connected via a Thuderbolt > DVI cable

It's been working fine ever since I got the new imac 2 years ago.


iMac 27" i7

AMD Radeon R9


...I did all the resets and recommended fixes

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Answer:

Reset the NVRAM, as per > How to reset NVRAM or PRAM on your Mac - Apple Support


If that does not help? Then I would try a different MiniDisplay Port/Thunderbolt to DVI cable or a MiniDisplay Port/Thunderbolt to DVI adapter and DVI cable.


FWIW I have several Samsung DVI monitors connected to different Mac's using Kanex MiniDisplay Port to DVI adapters and I've never had a single problem caused from updating macOS's.

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Apr 24, 2018 5:48 AM in response to morris2112 In response to morris2112

Reset the NVRAM, as per > How to reset NVRAM or PRAM on your Mac - Apple Support


If that does not help? Then I would try a different MiniDisplay Port/Thunderbolt to DVI cable or a MiniDisplay Port/Thunderbolt to DVI adapter and DVI cable.


FWIW I have several Samsung DVI monitors connected to different Mac's using Kanex MiniDisplay Port to DVI adapters and I've never had a single problem caused from updating macOS's.

Apr 24, 2018 5:48 AM

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Apr 26, 2018 4:36 AM in response to den.thed In response to den.thed

YES I got a new cable and it works now.

I'm pretty sure it was the thunderbolt > dvi adaptor... I bought a single 6' cable (no adaptor) for about $15 on Amazon and it works great. I never would have thought cable would go bad.

Thanks fellas.


T

Apr 26, 2018 4:36 AM

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Question: imac external monitor stopped working