When I logged into Windows (as a domain admin), Windows and the AMD software can see the 3rd monitor, but it simply won't display on all 3 monitors at once. I can use both display port or DVI with 1 display port or the other but not all 3. I did a quick SW search and saw a question from Jan 2013 where a guy had a similar problem, and according to the post, he got it working by uninstalling the AMD software and drivers and letting Windows pull down the driver. So I tried this, but when Windows saw the card it only recognized it as a standard VGA card even after a reboot. Then I went to HP's driver site and downloaded their AMD firepro drivers for the z400 workstation. The installer installed the basic AMD drivers and then pulled updates from AMD giving me the same AMD drivers as I had downloaded originally.
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