Rp0
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Causes
1. iPhone Needs a Force Restart
2. Dead Battery
3. Dirty Charging Port or Cable
4. Faulty Battery or Charging Port
5. Bad Power Button
6. Bad Display
It’s possible that it appears nothing is happening because the display is bad. An easy way to test this is to turn the phone on and listen for a sound. Also, you can move the mute toggle switch back and forth to see if it vibrates. If it vibrates or you hear a sound but nothing displays on the screen, then the screen is most likely the problem. Try replacing it and see if the display is still black.
You can purchase a new display assembly here, and follow the appropriate screen replacement guide for your phone.
7. Bad Logic Board
If none of the above solutions does the trick, your logic board may be faulty and needs to be replaced. You can either replace the entire board or attempt to diagnose and repair it using microsoldering techniques. That is a whole ‘nother beast!