I have similar problem to topic Blank Screen with 319.12 on Optimus Laptop but not at all.
Distro is Arch x64 with testing repo (xrandr 1.4.0-1, xorg-server 1.14.1-1, kernel 3.9.2).
Driver installed from repo, tried from .run file too, but got errors with loading kernel module and no screen found.
Notebook is Dell XPS 15 L502x with Intel HD3000 and GF 540m (screen connected to Intel).
xorg.conf in attached log file created using instructions from http://us.download.nvidia.com/XFree86/Linux-x86/319.17/README/randr14.html and I don’t see any errors in Xorg.0.log but screen is black with backlight working. Tried to use intel driver instead of modesetting but nothing changes. Problem is that to fix it I should use xrandr commands
xrandr --setprovideroutputsource modesetting NVIDIA-0 xrandr --auto
But every xrandr command with this xorg.conf gives error can’t open display (-q and -v too).
Log (why there is no button to attach file?):