The first troubleshooting option most users try when an iPhone is unresponsive is to restart or reset it. This essentially clears any electronic “hiccups” in the circuitry and encourages the phone to work properly again. If this option does not work, and your iPhone screen does not respond, there are a few more things to try before calling Apple's customer support for more assistance.
Your iPhone's battery could drain faster than you expect, and your screen may be blank simply because your phone doesn't have enough energy to power up. Connect your charger and let it charge for at least half an hour before powering on again. Attempt another reset while plugged in to restore functionality.
Restore With iTunes
If charging and resetting have no effect, your iPhone may have suffered a severe crash. Connect your iPhone to your computer and open iTunes. Select your device and create a backup if you can. Click “Restore” and follow the onscreen prompts to wipe your device and return it to factory condition. Once restored, you can reinstall your latest backup to recover your personal data.
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