Chosen Solution
Hello, I replaced my iPhone 6 battery and charging port and the phone turned on for a brief second going to the white background black apple screen. The phone appeared to be stuck in this mode so I turned it off. However the phone will not turn back on and is not connected when connected to a PC and when plugged into the charger the charging screen does not display.
Try to put your device in DFU mode(Google DFU mode) and connect to the computer and see if it detects. http://dashrepairs.com
It’s possible the new battery did not come with much juice in it, or is faulty. To verify, leave the device plugged into the charge and let it sit for a few hours. Once it has enough power, it should turn on.
