I’ve tried going back to the old PC and it no longer works there either with the same PSP failing symptoms. Could cutting the power when I had no other way to turn off the new PC have screwed the PSP firmware on both Radeon VII’s simultaneously somehow, and could updating the firmware fix it? AMD released an updated bios as an exe which is super unhelpful, I’ll download windows 10 if I have to but I’m on 4g going on 2g it could take a while and the system has already been down well over a week. If firmware is the issue then AMD cheaping out by not having a backup bios to switch to has screwed me right up. Does a firmware issue sound likely?