lets check this, go into the System BIOS at bootup, go to Boot Settings>BIOS Boot Settings>Hard-DIsk Drive Sequence, make sure that your RAID controller is listed first. If this is already correct, try going into the Raid controller bios screen and recreating the volume(s) there. NOTE: You will lose ALL data on the drives, so be sure you have it backed up!!
You might have something odd with your OS disc as well, because the openmanage disc reads the disc to be sure its the one you specified, and if it doesnt like it, something is usually wrong.