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Q: Multiple Displays not recognized at startup

MacPro Late 2013

Yosemite 10.10.3

AMD FirePro D500 3072 MB

 

I have three monitors connected with active displayport->DVI adapters.  I turn on the computer, it boots up (I know only 1 will work during boot) and when it reaches the OS, usually only 2 monitors are on and working.  The third, which is sometimes the same one that WAS on during boot, is now black.  I have to reseat the cable to get the video card to recognize the third monitor.  After that everything is ok until I reboot and then about 19 out of 20 times this behavior repeats itself.  There is that 1 in 20 chance that it works fine after a reboot or shutdown.  I feel like this is probably a firmware issue with the video cards but I am not sure.

 

I have the monitors plugged in ports 1, 2, and 5, according to this article. Any help or insight you can provide would be greatly appreciated.  I love this computer and this issue is a relatively minor annoyance, but I would love to fix it if possible!

Mac Pro (Late 2013), OS X Yosemite (10.10.3)

Posted on Jun 28, 2015 7:39 AM

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Q: Multiple Displays not recognized at startup

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