I received 6 boards recently and 4 of them have been working fantastically.
Two aren't working so well. After some troubleshooting I figured out that I plugged in the 8-pin CPU power instead of the 6/8-pin PCIe power.

Looking at pinouts, the 12v and ground pins are swapped on the two meaning I powered up two of my boards with 12v and ground lines swapped.
I'm hoping I've managed to blow a relatively simple to replace component and I get these boards working. I can't seem to find any schematics so I can try to narrow down what components are most likely to be failed.
Have any schematics been released yet for the BitBurner XX?
You may luck out and be able to replace that part.