I get what appears to be a perfect installation on my system. I then wait for it to finish telling me that it's doing the post installation work. Everything looks great until I reboot and then I can't get it to reboot. Midway through the progress indicator both of my monitors go black. This seems to be at the same point that on the first boot it went from single screen mode to using both of my screens.
I also can't boot with -x.
Since it came up and looked great for a while, I assume the post-installation is breaking something. Any hints how to diagnose?