[Black Cardinal]

Sure, but there isn't a ton to say.  My Onyx2 would fail to power up when you turned the key, and reported "PSU FAIL" on the MSC.  Life was busy at the time and I set it aside for a few years.  It was initially consistent but recently I tested to confirm the failure and discovered it to be intermittent.  The short story is that I eventually disassembled the PSU looking for failed electrolytic capacitors (taking pictures along the way) but found no component failures so simply cleaned up the MSC, midplane, and PSU connectors, and reseated everything.  It's been running reliably ever since, about 2 months now.  I think there was a connection issue with the control signals somewhere between the MSC and the PSU.