Often, the phone is powered on but "frozen" with a black screen. A force restart can jumpstart the system.
Use a toothpick or compressed air to remove lint from the charging port.
Plug it in for at least 30–60 minutes before attempting another force restart. iphone-6-no-power-solution-100-working
Go to product viewer dialog for this item. that won't power on, start with simple software and external hardware resets before moving to advanced board-level repairs.
If the battery is completely drained, the phone may not respond immediately. Often, the phone is powered on but "frozen"
Press and hold the Home button and the Power (Sleep/Wake) button simultaneously.
Use a known-working, MFi-certified Apple cable and wall adapter. Cheap, non-certified cables often damage the internal charging IC. Plug it in for at least 30–60 minutes
Keep holding both for at least 10–15 seconds until the Apple logo appears. 2. Check Charging Components