iPhone not turning on

If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

Which ends with:

If you need more help

Contact Apple Support to set up service if you have any of these issues:

• You still see a black screen after charging, force restarting, or following the steps in this article.
• You see a black screen, but you can hear alerts, sounds, and vibrations.
• The screen remains black, but the device chirps when you unmute it and connect it to power.
• Your screen is on, but it doesn't respond when you tap, slide, or try other gestures. 
• You can't force your device to restart because a button is broken or stuck.
• Your device is stuck on the Apple logo, displays a solid color, or isn't recognized in iTunes.

jdw46 Said:

"iPhone not turning on: had my iPhone XR on charge and now it will not turn back on, ideas? I've tried the reboot sequence"

-------

Troubleshooting Power Issues:

I. Perform a Restart:

A. Try Force Restarting your iPhone:

Save any information that need be. Then perform the restart.

Go Here: Force Restart iPhone - Apple Support

B. Try Manually Restarting your iPhone:

1. Go To: Settings
2. Select: General
3. Scroll to: the Very Bottom
4. Select: Shut Down
5. Slide Finger: to the Right
6. Wait: 30 Seconds
7. Power One: the iPhone
8. Try this Once More

II. A Few Apple Support Sites that May Help:

• iPhone Battery and Performance

• Charge and monitor the iPhone battery

• About the battery usage on your iPhone

• About Optimized Battery Charging on your iPhone

• If you see "Your iPhone battery may need to be serviced"

• Use Low Power Mode to save battery life on your iPhone