iPhone 6 black screen

Hey HMDixon,

Thanks for the question. If I understand correctly, the iPhone will not start past the iTunes symbol. I would recommend that you read this article, it may be able to help the issue.

If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support

If your device turns on but gets stuck during start up

You might see the Apple logo or a red or blue screen for a long time during start up. Try these steps:

1. Connect your device to a computer and open iTunes. If you don't have a computer, you can borrow one, or go to an Apple Retail Store or Apple Authorized Service Provider for help.
2. While your device is connected, force it to restart. Press and hold the Sleep/Wake and Home buttons at the same time. Don't release when you see the Apple logo. Keep holding until you see the Recovery mode screen.
   
3. When you get the option to restore or update, choose Update. iTunes will try to reinstall iOS without erasing your data.
   

iTunes will download the software for your device. If it takes more than 15 minutes, your device will exit recovery mode and you'll need to repeat steps 2 and 3 again.

Thanks for using Apple Support Communities.
Have a good one