I replaced both the battery and the logic board (twice), but my iPhone 5c still won’t power up. Aside from human error; on My part, what else could be the problem? Since I replaced the logic board twice I am assuming the logic board is no longer the problem. Having said that I had to buy from a source I was not familiar with. Are there any other parts that could cause this problem? Again, I am open to human error on My part, but I did want to ask.