Resolving Solid Fault Light...
Ok, after talking to a Rockwell Tech about this problem, he told me the simple 99% fix...
Are you ready for this?
The power supplies ship configured/jumpered for 240VAC (to prevent accidentally killing them by hooking them up to 240V.) But most folks wire them up to 120VAC.
If you check the AC and DC output voltages, they look OK. But the processor knows better.
Moving the power supply jumper to 120V solved my problem.
I don't know why they don't make the power supplies auto-sensing, it's almost a freebie these days...but AB is NEVER about freebies!