Aporte original por: Gord Holden ,
My LG 4 was DEAD. Batteries were fine, but it would NOT turn on no matter what I did (all the above suggestions). However, I found a YouTube video where the fellow said that when ALL else failed, stick the phone in the freezer for 30 minutes. Yes, bizarre. It worked. Phone started up immediately and has been working ever since. Hope this helps someone.