I have an iPhone 6 and i had been using it and it was working great and then i locked it and now it won't turn on it is just a black screen but I can tell that siri works and also like when i plug it in to charge it makes a noise.
iPhone 6, iOS 9.0.1, might be most updated iOS not sure.
Turn your device off and then force it to start. To do this, press Sleep/Wake and Home buttons and hold them for at least 10 seconds.
If this does not help, take a look these Apple Support articles:
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.
As a final step, try the recovery mode. Turn your device off, then plug it to your computer with the home button pressed. Keep the Home button pressed until you see the iTunes logo on the screen of your iPhone. After that on your computer you should see the iTunes window saying your iPhone needs to be restored to factory settings. Click on the restore button.
More info here: https://support.apple.com/en-us/HT201263
If these steps don't work, contact Apple and ask for help.
iPhone screen went black but it still works?
