Ok, I finally got video working. I ended up having to do a different display (the output is apparently hard-coded for 720p at 50hz??,) different microsd cable, and found that I couldn't have the display or keyboard hooked up during first boot -- the board would hang indefinitely. But now I'm able to at least view the desktop on a TV.
Going to try to dig through some things to figure out how to fix the display resolution hopefully.