I don't have your hardware but this thread refers to a problem with dual monitors and the same Nvidia card as yours. Maybe worth a look:
Which particular version and flavour of Z15 do you run. e.g. Z15.3 Core, Lite etc ?
I don't have your hardware but this thread refers to a problem with dual monitors and the same Nvidia card as yours. Maybe worth a look:
Which particular version and flavour of Z15 do you run. e.g. Z15.3 Core, Lite etc ?