...SOLUTION: Turn the system off and attempt to reattach any loose connections. If this does not work, replace the cable(s) and connection(s).
Description: At power up, the system does not detect a configured physical drive or an external storage unit that was previously detected before the last system shutdown. This event can occur if the user removes one or more drives after the system is powered down or if a loose cable or malfunction prevents the drives from spinning up.
If a drive or enclosure has been removed or disconnected, do the following:
If drives are failed or purposely removed while the system is off: