Reasons why iphones don't turn on:
One, the power is out. If you consume all the power of the battery, the charging needs to be charged to 5% at this time in order to start normally. So in this case, please let the phone charge for a while before trying to turn it on.
2. Software failure. If you are sure that the current phone battery is sufficient, but it can not be turned on normally, there may be a problem with the mobile phone software system. At this time, we can try to press the Home button and power button on the home screen of the phone at the same time until the screen is lit up and displayed.
Third, the system crashes. If none of the above solutions work, and you see an iTunes connection screen on your iPhone's screen, the phone has entered recovery mode. When faced with such a situation, it is usually only for the phone to restore the system.
In view of this problem, I think there are the following reasons.
First: the charging head is not plugged in.
Second: the tail plug of the device is broken.
Third: the battery efficiency of the device is too low to meet the replacement standard.
Fourth: The charging is not the original data cable, the current is unstable, and it is not rushed in.