if you formated the hard drive, yeah, it will not work with the case as a NAS anymore, + data and OS are all gone.
NAS are not the same as USB hard drives. You cannot just format the drives.
http://www.cnet.com/how-to/digital-storage-basics-part-2-external-drive-vs-nas-server/
You would have to restore the OS.
Here are the guides:
http://community.wd.com/t5/My-Book-Live/GUIDE-How-to-unbrick-a-totally-dead-MBL/td-p/435724
Added:
:smileyvery-happy: http://community.wd.com/t5/My-Book-Live/MY-BOOK-LIVE-2TB/m-p/711426
I knew it sounded familiar, oh well, I guess you are looking for others to respond, so I will not comment anymore.
