
If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone.

If the display remains black, go to next step.If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.If it immediately turns off, seek service. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen. Update to the latest version of iOS if necessary. The home screen appears: The iPhone should be working.Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion.

If the button is damaged or is not functioning when pressed, seek service. If it does not function, inspect it for signs of damage.

You may find the troubleshooting steps in the article below helpful.
