I have an Asus ROG GL703VD and have a similar issue. The display shows the ROG 
display, then flashes purple for a second (Grub menu splash before the Ubuntu 
splash logo, which doesn't display on the laptop, but does on the HDMI display) 
then goes blank and never comes online. Even pressing CTRL+ALT+F1-6 does not 
switch between virtual terminals on the laptop display, it does shift on the 
mirrored HDMI display. The only way to get a display is to hook up a monitor to 
the HDMI port and then logging in and setting the display to mirror mode. In 
fact, this is the only way to install Bionic on the device as even booting the 
install media with nouveau blacklisted doesn't work. In previous releases, 
running nouveau.modeset=0 would bring up the display properly and then you 
could install, but with Bionic, this is does not work. Also, installing the 
Bionic kernel in Xenial or Artful creates the same condition for those 
I have looked at the logs and settings everywhere, and from what I can tell 
everything appears to be loading properly. Gnome sees both displays when 
connected, but the laptop display remains black.

You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mesa in Ubuntu.

  nvidia-390 fails to boot graphical display

Status in mesa package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-390 package in Ubuntu:
  Fix Released

Bug description:
  I'm using Bionic with the new 4.15 kernel. I've been using the
  nvidia-384 driver with no problem for a while.  Today I issued "sudo
  apt-get upgrade" and I was prompted to upgrade the nvidia driver to
  the nvidia-390.  After installing the driver and rebooting, I was only
  able to boot in to the tty terminal.  The graphical display failed to
  boot.  I have had similar problems with nvidia driver version 390 with
  Arch Linux and with Open Suse Tumbleweed.

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