0.71 cannot boot on my 4 cards rig, on which nvOC works well.
I got black screen at the first boot, restarted by hand after 10 minutes. after the second boot, it showed a ton of errors, I took a video and would like to send it to your email.
For the first boot, I had to unplug all my GPUs except the one connecting to display. Boot up, then I installed a driver (via the provided 1st script). Shutdown & plug everything in. Reboot. (Now it works for me.) Run 2nd script. And then edit the .coin file.