Thanks for joining the Desktop Board community.
I understand you cannot boot from an Intel RAID controller.
At this point, please try updating motherboard BIOS to the latest version:
File name: EBH7710H.86A.0101.EB.EXE
Please check BIOS settings under Security Tab and enable or disable Expansion Card Text, then check if you are able to boot from RAID card.
If you are still experiencing issues with the Intel RAID card, please address this matter at the server community: Servers