Sergeant_Sneaky :
Does the monitor find a signal using the same VGA cable that you tested with the onboard graphics? Also, are you using the Dual Link DVI that came with the monitor? What are your full specs including PSU make and model?
Yes and yes also
Kingston HyperX Fury Black Kit DDR4 2133MHz 16gb (2 x 8GB)
Intel Core i7-6700k
Corsair Hydro H110i V2 Extreme Performance
Samsung SSD 850 EVO (Basic) Series
Corsair CS-Series CS850M
ASUS Z170 PRO Gaming
MSI GeForce GTX 1080 Founders Edition