Help with My Book Live Duo PLEASE

Welcome to the club, the same thing happened to me. The way I fixed it was by reinstalling the firmware. Did you by chance enable SSH? If so, you can reinstall by SSH. If not, I don’t know what to tell you, other than this book is plagued with problems.

http://community.wdc.com/t5/My-Book-Live/Firmware-Update-via-SSH/td-p/310064

There’s how you install via SSH.