Got mine back working!
Hi,
I created an account and got back here just to let people know that I could also make it back to work, thanks to God.
Well, mine was in the Black Screen White Led state and nothing was getting it back to work, I´ve tried almost everything in this thread, then, I got my wife a new Moto G (3rd generation) which is beautiful, then I got the charger from that Moto G and left mine 1st generation Moto G dead charging for some hours.
Then, I tried to turn it on and nothing happened. By that, I decided that I would open the mobile just to look at the parts to see how it was built, then I removed the back cover, the system board (and the connections), that silver stuff above the system board, did not remove the screen, touch and glass. Then put everything back and try turning it on and voilá! It started working back, everything was like before.
Probably, the charger put the battery back to work, but since it was not booting because it was probably in a bug/loop/error state, removing all the pieces and connection then putting everything back and connecting made some connection that could be loose to work back again.
Well, that´s all I did and it worked! =DDDDD