“Drive not ready”

I am having trouble “reaching” a WD Enterprise WDE9100 ultra fast wide SCSI 3 HDD. It only returns the error msg, “drive not ready”. What is wrong,(my fault?)? All pin connectors are properly placed, I believe, altho I do NOT have a pin connections read-out. It is one of two I recently received, and after buying a new controllor card, the other is operating normally.
can anyone suggest an answer? thanks.
AZBRUSHAPE@AOL.COM