For now we can close this thread. The only solution we confirmed worked is a total replacement of the FC630 motherboard. What caused the motherboard to quit working? The only possible root cause that has any correlation to the timing is the installation of the IDSDM cards, replacing the rSPI cards.  Maybe there was a small charge that the anti-static wrist strap couldn't handle, maybe the IDSDM cards are defective, I guess everything is possible. Short answer, don't mess around with the FC630 (or other), if it is working leave it alone.  The thought of redundant flash storage to run ESXI is a nice thought, but if the part that is supposed to improve the FC630 hardware actually breaks it, then it isn't worth $.02 (or more accurately it is worth about $250 in motherboard replacement cost).  Thank you to everyone that helped out and gave us suggestions.
I've got four FC630 blades in a FX2S chassis.  I upgraded all four FC630's with Internal Dual SD Card Reader Modules; when trying to power on I get a blinking green power light but no power.  I removed the Dual SD Card Reader Modules but get the same result. I can only assume the Card Reader Modules had something to do with it, but I'm at a loss now that everything is back the way it was. Am I missing something here?
FC630 Blade Power Light Blinking - will not power on