Have been playing around with my gtx 960 gaming g1 (4gb). I have installed the webdrivers (latest nvidia). Bios is set to pci as primary. I can run my 5K display at 2560x1440 but nothing higher. If I enable the nvda_drv=1 bootflag, I get stuck on an empty fuzzy background screen. The rig is alive, when I punch my password on this screen it proceeds to the homescreen but all menus are grey, there is no mouse cursor and no keyboard signal. Any suggestion? My system is as specified in my profile (z170x ud 5 th, i7, 16 balistix sport, later el capitan osx). Thanks in advance!