There is no LED support for notifications … only charging.
The response posted elsewhere from Motorola …
There is a green LED light that works only when you are charging your phone from a very low battery state. It shows us as its sign of life and shows us that the phone is charging but there is not enough battery power yet to turn on the display of the phone. Since you have charged the phone for few hours, try to press the power button to turn on the phone and see if that works.
Once it has a sufficient power, the light will stop flashing and the screen will light up.
… Thom