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  • also try older drivers, not the latest one: nvidia.com/Download/Find.aspx?lang=en-us Commented Dec 14, 2016 at 5:33
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    also put the GPU into a different PCIe x16 slot . also check if your PSU supports the required power of the GPU. Commented Dec 14, 2016 at 5:40
  • @magicandre1981 Interesting update: I downloaded Ubuntu 16.04.1 LTS onto a bootable USB drive and booted into that. Both monitors immediately worked at full 1920x1080 resolution. So the hardware seems functional! My remaining challenge is to figure out why it stopped working within Windows.
    – Ryan
    Commented Dec 14, 2016 at 18:12
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    You wouldn't be the first to be in that situation. The drivers are different, or the Linux driver ignores the error. Have you looked for interesting errors in the Event Viewer?
    – harrymc
    Commented Dec 17, 2016 at 15:04
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    Another check in linux would be to run glxinfo and look for anything suspicious (Lot of output tho) or just run something that requires 3D acceleration. Maybe the reason it's still working is because it's using safe fallbacks? Commented Dec 20, 2016 at 12:47