Ira Grolman

Q: problem with external monitors

Hi, I have a retaina 27" imac.

I have had 2 external monitors connected, and have been really happy ... until yesterday.

There was an El Capitain update, and all of a sudden, the imac couldn't see the two monitors.

I then installed Siera, still no external monitors.

I tried each  monitor with the same cables connected to my laptop, and the monitors work just fine.

(By the way, the laptop is running siera)

So i figured that my dvi port somehow got fried. So I got a new imac. And transferred my data.

And before putting my new machine in place, I connected one monitor. And it worked!

And then I shut down, added the cables for the external monitors. And now I'm not getting anything.

I've not been able to replicate any image on an external monitor.

So I've reset the pram, the SMC.

All cables are working. All monitors are independently working with another machine.

I've tried detecting monitors.

What am I doing wrong ?

Posted on Sep 22, 2016 7:48 AM