I also have a thunderbolt external raid array connected. This was a problem when the Mac Pro was first released, but improved with Yosemite. One display uses a mini-display port converter and the other HDMI. I upgraded my Mac Pro 2013 to El Capitan and only one of my two identical displays would work.Connect to the network to download El-Capitan operating system. Click on the Wi-Fi signal icon which is located in the right side top corner. Release all keys when the Apple logo appears on the screen.
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