You need drivers.  2008 R2? [URL] Download and run to extract, the put the files on a flash drive, and click the Load Drivers link on the page that says no hard drives are found. Why RAID 0?
This is a newly purchased machine ordered without OS. I attempted to install Windows server 2008 R2 Standard but stalled at the point that drivers for the hard drive needed to be loaded. In preparation for the installed I downloaded all of drivers relevant to the hardware and had a disc ready for input. Files were burned directly to the root directly but still the installation failed because it could not find the drives. I cannot get off the ground to get Open Manager or any other tools started because drives cannot be setup.  Can anyone tell me how to get started with this? Thank you, ykelley
PE R720 Hard Drives Not Recognized