According to the description provided you could be experiencing a compatibility issue with the PCI RAID card.
Our recommendation is testing with a higher voltage power supply. Try the system out of the chassis to avoid any possible grounding.
Thanks for the ideas. Running outside the chassis did not resolve the issue so this does not appear to be a grounding issue. I don't have another power supply so I can't try that. However, it's a 220W supply running an atom, RAID card, 2 hard drives and 1 SSD so I think that's OK.
My money at the moment is on some incompatibility between the hardware. I'll try another solution -- perhaps a mini PCI e SSD. Hopefully those are supported by the board.
It appears mini PCIe SSDs are not supported either. Well, that's it for me. This board is useless for my application.