Unplug and replug every cable out/in the drives.
MoBoard is ASUS M5A78L-M LX. I have unplugged all other drives and tried to reboot...no go!
In addition, I installed the O/S on one of the magnetic drives to see if Windows Disk Manager would see it. No go!
Basic problem seems to be the BIOS doesn't see it on boot up any longer.