[fizzout]

Well, the other power supply finally showed up. I installed the new power supply and that showed that instead of the Meanwell driver having failed, it was one of the LEDs that failed. The Meanwell driver is working fine. I replaced the bad LED (which was easy to find), and the string now works. Since the Meanwell drivers are all working, I am not using the single power supply, which didn't actually work that well anyhow.