When updating BIOS, this usually resets BIOS configuration to defaults. If the computer is not booting up, it may be that your computer BIOS has set the machine as IDE mode. Look for BIOS settings to change SATA mode back to RAID.
If you still have problem booting up the system go here for more assistance:
thank you for your response -- however, I've already done these things, to no avail.
I was hoping for a response along the lines of a link to a disaster recovery manual/procedure.