Power down the server, remove the power cord, and hold the power button in to drain the remaining power off the board. Open the server and reseat the PCIe expansion cards and risers. Then power the server back up. If the error remains, go through the same process, this time, leave the RAID controller out and then power the server back up.
For further troubleshooting information, here is a link for a pdf: support.dell.com/.../HOM.pdf
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