So Iím in the throws of wrapping up my computer upgrade and everything has worked just fine until I went to feed signals to my monitors.

My GPU is a holdover from my previous configuration and itís a Gigabyte GeForce 1080 OC. On my previous build, I was able to get displays on both monitors (Dell 27Ē) by feeding one with a DP to Mini-DP and the other with a DVI cable.

I got two new DP 1.4 cables for the new configuration and it turns out that neither monitor will show a signal when fed from DP ports on the 1080. However, the DP to DP-Mini still works on one monitor and the second is now working on an HDMI signal. So I have a picture now on each monitor but Iím baffled as to why the DP cables failed to pass a signal Full-size DP to Full-size DP.

Is there a Card Setting, Driver Setting or some other configurator setting Iíve missed in Win 10 Pro or the software for the 1080?

Gigabyte z390 Designare Mobo
Samsung M.2 NVMe 1TB SSD
32Gb Patriot Viper RAM
Corsair 850W PSU (Card obviously has power and Iím feeding the PCIe bus as well)*
2 X Dell 27Ē Monitors @ 2560x1440 60Hz (I forget the exact models. One is about four years old and the other is about 2 years old)

*Card was not new to me. Bought it used from a friend.

Thanks for any ideas...