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Multiple display mirroring on a Mac Pro Desktop Macs
While not everyone has this problem, if you do a lot of video work, you may have come across it:

a) You have a Mac Pro with dual video cards, and each video card can drive two monitors. You use 2 desktop monitors and 2 additional monitors (such as projectors on HDTVs, which is how I use this setup).

b) You want to turn on Display Mirroring, but not the expected way, where all four displays to show the same image. I wanted Monitor #1 to mirror to HDTV #3, and Monitor #2 to mirror to Projector #4. Typically, once all the displays appear in the Displays pane of System Preferences, all mirroring does is display the output of Monitor #1 on all four devices.

After several months of talking with Apple Geniuses, consulting multiple AV companies and purchasing useless video splitter boxes, we accidentally discovered a solution to our problem.

Open System Preferences > Displays. Hold down the option key while you drag any monitor icon on top of any other monitor icon. You will see those two icons layered on top of each other to imply mirroring. Now you can selectively mirror any monitor to any other monitor.

We have successfully used this on Snow Leopard and Lion, on Mac Pros.

[kirkmc adds: I'm a single-monitor guy, so I can't test this. If anyone has four monitors and a Mac Pro, feel free to tell us, in the comments, if it works correctly.]
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Multiple display mirroring on a Mac Pro
Authored by: sd on Mar 12, '12 07:38:47AM

In fact, it just work the easiest possible way!
Very convenient, kudos Apple



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Multiple display mirroring on a Mac Pro
Authored by: agentx on Mar 12, '12 09:43:47AM

Sorry to say that Apple Genius's half the time dont know their arse from their elbows with high end usage.
Wish you had posted a request on forums months ago we have been doing this for ages at my AV sites.
But good to see it up as a hint.

Edited on Mar 12, '12 09:44:17AM by agentx



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Multiple display mirroring on a Mac Pro
Authored by: BMarsh on Mar 12, '12 09:46:45AM

I had run across this information elsewhere when I was doing the same thing on my own MacPro at home, surprised it wasn't already on Mac OS X hints.

So yes, confirming these instructions do work. (I sometimes mirror my 23" Cinema Display with my HDTV, while leaving my 2x19" LCDs independent)



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Multiple display mirroring on a Mac Pro
Authored by: pbeyersdorf on Mar 12, '12 01:41:31PM

Thanks for the hint. I'd been wanting to do this for some time but didn't know how.



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Multiple display mirroring on a Mac Pro
Authored by: rusto on Mar 13, '12 07:01:04AM

Ah, this simple drag-and-drop method for enabling mirroring is so much easier to explain to a panicked presented calling me from their corporate meeting on a cell phone.



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Multiple display mirroring on a Mac Pro
Authored by: leamanc on Mar 13, '12 09:24:18AM

Very surprised that the Geniuses didn't know this one. This has been standard Mac OS behavior ever since there been a way to set up mirroring.



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