monitor is plugged into gpuIs your monitor connected to the GPU or the motherboard? Is your gpu listed in device manager? Have you plugged all the appropriate power cables from the PSU to the GPU?
Run winver and let us know the full version number listed for Windows.
Run dxdiag, go to the display tab, make sure your driver supports WDDM 2.0 or higher.
GPU info in task manager is a Windows 10 version 1709 addition. It wasn't implemented in your version of Windows.