HDD failed on PS4000. I replaced the HDD and reinserted the caddy back into the chassis. HDD still marked as failed. I replaced the caddy with a new one with the original HDD and reinserted into the chassis. HDD marked as failed. (I understand why: a failed drive is a failed drive forever...got it.) I replaced the original HDD with a new HDD installed in the new caddy and reinserted into the chassis. New caddy with new HDD still marked as failed. What do I need to do to get this to work? Thanks for your help!