Thanks. Sorry for the delay. I've tried this with a scratch load of 1709, via MDT with no drivers and via MDT with just this driver assigned to the image.
It's definitely not a hardware issue. When installing a different drive, rolling back a driver, rebooting, or booting into safe mode, I get the same issues...
Once back in normal mode, a DVI cable WILL NOT give video. I can attach a VGA cable with a VGA/DVI adapter and get video from the blue port, then disconnect that and attach a straight DVI cable and get no video.
I repeated this in multiple variants, multiple times. I do not have this issue with 1607. Once 1607 gets updated to 1709, the issue returns.