PCIe HD Core not initializing hardware

[milesofwire]

So I’m pretty sure I know the answer to this already, but if a Core card basically locks up pro tools on startup, it’s toast, correct?
If I put a known working core in, everything works.
Digitest won’t even start with the bad core in the first slot.
But when I put it after the good core it shows up in Digitest and passes ironically.
But putting it back in the first slot, it’s a no go.

[milesofwire]

Ok, the plot thickens!
So I have this one core card that won’t run in an expansion chassis.
And I have another the works fine in the chassis.
If I put the one that isn’t happy in the chassis in a Mac Pro it’s fine!
Definitely scratching my head on this one.

[Darryl Ramm]

Be careful in all this that you don't have an intermittent bad board, PCB cracks, components physically damaged, etc. especially the capacitors towards the edge of the boards.

[milesofwire]

Power supply in the expansion chassis was the problem, everything is rock solid now!