LED light and Lollipop update
Honestly I had this problem as well... no matter what I had done about it I was having problems with it. In the end I took out my SD card and did a factory restore. It fixed my problem and it might be what you have to do to fix yours. I recommend taking out the SD card if you have one because I tried with it in and even factory restoring didnt work for some reason. 

hope this helps!