I apologize for the post spam.  I've managed to figure out the issue after getting my hands on a known-good system. Turns out one of the PCI-X risers died. I can't tell which one because the known-good system had PCI-E risers and apparently the system won't boot with mismatched risers. 
Received this error while attempting to configure the iDRAC card for DHCP. Doesn't appear to be a related issue, however I am unable to reach the BIOS due to the system halting after the training error.  Any assistance is appreciated.
PE 1950 PCIe Training Error: Embedded I/O Device 10