My Book Live Issue

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.