Formating problem when Replacing HD


when I replace one wrong HD in MBW II blue ring (Raid 1), the WD software anounce the new drive (A or B) detected…but when I want to format this HD, the message is “No new drive detected”. I have a second MBW, same problem with this one too… so no way to have my MBW working again. Do you have any Idea to solve this problem?