Thunderbolt ports not working on late-2012 iMac 27"

usagora · Jul 16, 2016

GraceGuitars said:
I will. I did order it and it should be here Friday.

Just set it up (NewerTech USB 3.0/2.0 to DVI, VGA, HDMI Video Display Adapter) using the included DVI-HDMI adapter, and it works just fine. My only complaint is that OS X animations are horrible and slow on the secondary display (see video below). For everything else so far, including full-screen video, there is no latency issues that I can detect.

Slydude · Jul 16, 2016

Thanks for that update. I was wondering how that would work.

b1199s · Nov 22, 2017

Yesssss.....!

AMACL said:
Hello,

I had a similar problem as GraceGuitars: thunderbolt-to-HDMI cable from my mid-2011 iMac 12.1 (A1311) did not detect my Samsung external monitor. Combination worked with my MacBook Air and another, more recent iMac.

The solution - discovered this morning after trying everything yesterday : push the Thunderbolt plug fully into the computer port. I know, it's the first advice on the list, but the port on the older iMac was 'sticky' and I had to apply more pressure. Maybe the first T-bolt ports were not as good as later ones? Or I just got one that was slightly off-spec?

Anyway, a relief.

THIS actually worked for me!! Was struggling with this exactly 2 years ago, in the end I gave up.
Wanted to connect MacbookPro 13 Retina 2015 to iMac 27 2011 via a new thunderbolt cable for 2nd screen, but no connection.
By googling the issue again after I bought a thunderbolt 2 dock this week for the MacBook Pro and trying the target display function on iMac again, I read this.
Pushed it good ... ... and indeed!! heard some 'click' and the problem was solved, I could not believe it! after 2 years

usagora · Dec 4, 2017

AMACL said:
Hello,

I had a similar problem as GraceGuitars: thunderbolt-to-HDMI cable from my mid-2011 iMac 12.1 (A1311) did not detect my Samsung external monitor. Combination worked with my MacBook Air and another, more recent iMac.

The solution - discovered this morning after trying everything yesterday : push the Thunderbolt plug fully into the computer port. I know, it's the first advice on the list, but the port on the older iMac was 'sticky' and I had to apply more pressure. Maybe the first T-bolt ports were not as good as later ones? Or I just got one that was slightly off-spec?

Anyway, a relief.

b1199s said:
THIS actually worked for me!! Was struggling with this exactly 2 years ago, in the end I gave up.
Wanted to connect MacbookPro 13 Retina 2015 to iMac 27 2011 via a new thunderbolt cable for 2nd screen, but no connection.
By googling the issue again after I bought a thunderbolt 2 dock this week for the MacBook Pro and trying the target display function on iMac again, I read this.
Pushed it good ... ... and indeed!! heard some 'click' and the problem was solved, I could not believe it! after 2 years

Wish that worked for me. All I get when I put more pressure on it is marks on my thumb and index finger from pushing so hard...no "click" or anything else.

Thunderbolt ports not working on late-2012 iMac 27"

usagora

Slydude

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