My Book Not shutting off

I’ve had my My Book extenal harddrive for about a year and a half.  In the past week it has stopped shutting off when the computer turns off. I’ve tried manually shutting it off but it will not respond. I have to manually unplug the harddrive for it to turn off. King of hard to sleep with this big neon blue light shining in my face. Any ideas on how to fix this?