I think I might actually be running into some of the broken aspects of this motherboard now. When trying to get VCore up, I notices SLEEP_S3 was missing on one transistor, keeping a few rails from turning on (in other places, it was present, and according to the schematic and board view I have, they should be directly connected). Since the enable signal for the VRM controller (RT8894A) is still low with no obvious reason, I tried simply pulling it high (first with a resistor), which had the chip heat up a lot. It should just be an input, so that chip is likely bad (the high-side VDDP mosfets being stuck on also isn't a great sign, and puts that rail at 12V instead of the usual ~1V it should be). Still not bad for the price I paid for it, but I might have to look for a more functional one (maybe with a better chipset too, 4 gen2 lanes are fine, but more could be nice to have, even if the chipset it still only connected with one lane).