WD MyBook Live light is always flashing green - never turns to blue

Chances are it is indexing your media.

Do some searches on this forum as this topic has been covered quite a bit. There are also different solutions. It will all depend on your needs.

Here are some:

http://community.wd.com/t5/My-Book-Live/Runaway-mediacrawler-The-Ultimate-Solution/m-p/578720/highli…

http://community.wd.com/t5/My-Book-Live/MBL-works-fine-Green-Light-blinking-forever/m-p/572801/highl…

http://community.wd.com/t5/My-Book-Live/MBL-Sleep-Mode-and-firmware-02-32-05-046/td-p/523307

http://community.wd.com/t5/My-Book-Live/Blinking-Green-Light/m-p/577282/highlight/true#M23578