I got the monitor to work. Turns out you CAN'T drive it with a Pi 500+, even though the insert in the monitor box says you can, but at lower brightness settings. (I turned the brightness all the way down and tried powering it from the 500+ but no dice.) If you get one of these, you will DEFINITELY require an external power supply, at least if you're using it with a 500+. I'm using the (I think) 95w power supply from an old MacBookPro, seems to drive the monitor like a champ.