Stephen Barrante

Q: Third display not recognized by MacPro

I currently have 2 Dell monitors hooked up via display port adapters to two thunderbolt ports on the back of the MacPro. I just purchased a 3rd external TV monitor to use for previewing edits and connected it to the HDMI port on the back of the MacPro. It isn't recognized by the system as another display. I also tried a third thunderbolt > hdmi adapter that I had, with no luck.

 

When I remove one of my two monitors the HDMI port appears to be active and I get the extended desktop on the TV. Plugging back in the monitor doesn't bring that monitor back. I have to first unplug the HDMI, and then plug the monitor to get my dual configuration to return.

 

Very surprised by this, as my expectation was I can run 3 4k displays at once on this. I'm hardly pushing the limit with two 20" Dell 2007FP's and one external TV.

 

Any thoughts on why this is happening and how to resolve?

 

Thanks

Steve

Mac Pro, OS X Mavericks (10.9.4), 32GB RAM, 3.5Ghz 6-Core, Dual D500

Posted on Jan 16, 2015 11:43 AM

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