With the help of @DosFox I’ve been able to test the PSU, motherboard, and CPU cards (sans IO and RAM). It’s not much, but this flickering screen of a grid like pattern is exactly what is seen from their rig in the same state. And the scan converter I’m using detects the right sync rates of 22.73Khz @ 60hz (which are the rates @compu85 got using a projector). So this is promising!