I have (likely) the same issues with an Asus 1070 and a BenQ XL2730Z, using DP. I have an EVGA Z170 Classy K, Windows 10 Pro 1809. I experience two problems:
1) When starting from a cold boot (never on soft restarts), the EVGA splash screen appears but gets stuck there. No windows loading circle as normal. It will stay like this until I hit the reset button, or eventually it will switch to a "light blue" screen and hang there. Post code readout has switched to CPU temperature at that point, so it doesn't seem to be a problem with POSTing.
2) When I do press the reset button, it will then proceed to load windows but when the windows logon screen shows up I only get a blank screen/no signal until I turn the monitor off and on again. At that point everything works normally.
I had recently discovered the sticky post with the link to the nvidia f/w update, and I was very excited to finally have a fix. Unfortunately it did not work for me (the update was applied, but the problem persists). I was ready to switch over to HDMI, but now that nvidia supports using Freesync on DP, I am stuck with it if I want to use G-sync/Freesync.
Edit: Forgot to mention that my drivers are up to date.
post edited by gbaker3 - 2019/01/24 11:13:18