R720 not detecting hard drives

We have a dell r720 with SAS backplane and s110 raid controller. We previously used this server as esxi host and now are wanting to use as a physical windows machine with onboard storage via backplane. Inserted several SSD Sata drives and can't get them to register in the system. Although idrac and display on chasis is indicating drive removed, inserted, etc. No indication in bios, etc.

found some articles that talk about removing power cords, holding power button for some time, resetting idrac and then powering on. tried this with no luck.

Please let me know if you have any other recommendations. thanks