I have the same problem. I updated yesterday to 4.4.2,but I think It hasn't to do anything with it...Everything working great. Few hours ago I put G2 on charge... 100% charged. I turned it off... 15 min ago I cannot turn it back on... No way... Holding power button for ages nothing,power+down nothing,power+up nothing,pc cannot recognize it also...Put on charger again,nothing,black screen,not even a back-light!?!?!?! What could It be??? Not rooted,everything stock!!!
LG G3 White 32GB
LG G2 White 32GB SOLD