We have several C6105 servers and all of our Nodes are running the same LSI 9260-8i add-in RAID controller. We recently purchased another C6105 and removed the In Mezzanine slot: LSI® 2008 6Gb SAS mezzanine and replaced with the In PCIe slot: LSI 9260-8i add-in RAID controller. After making this hardware change the Node simply flashes the Hard Drives but won't power on. I have been able to duplicate this issue on a second node using and a second PCIe LSI card. Also this may be nothing, but the fans seem to be running a lot faster now as well.
Prior to the hardware swap the Nodes were configured and running ESXi 5.0 without issue.