My iPhone 4 won't turn on or charge
It was fine last night. I left it charging at night and upon waking my iPhone wouldn’t start. Black screen, no charging logo after pressing the power button. I wondered if the charger wasn’t working, so I used another one, a second identical charger, and then finally an iPad charger. Nothing changed. I tried pressing the power button for 5, 10, 20, 30 seconds and nothing. I did the same with both buttons (Home and Power). I tried to get it into DFU mode and nothing. The computer does not recognize it, iTunes either. Then, by tightening the buttons frantically (connected to de USB port of the computer), appeared for a split second the charging logo, saying it had no charge.
I researched the internet and no solution was applied to my case.
EDIT: Sometimes when I disconnect the iPhone symbol (No charge symbol) appears.
iPhone 4, iOS 4.3.1