Got back to working on the VisionFive today, and couldn’t get it to power on (no leds or anything). Tried all sorts of things, however it turned out that swapping out the supplied USB power adapter (which for me requires a an Australian converter plug) did the trick. It’s now using a 5V/3A HeyMix USB-A power adapter. I also had to reflash the memory card as I wasn’t getting any boot sequence with the new power adapter, so with the new ubuntu server card I had to wait a few moments while it does the initial expand. Now everything is working fine. Posting here in case others are facing the same issue.