my iphone 6 displays shows pink and purple verticle lines and stopped working
iPhone 6, iOS 9.3.4
Sounds like a hardware issue.
You can make an appointment at an Apple Genius Bar.
Or send the iPhone in for service > iPhone Service Answer Center
I suspect that the screen or digitizer is defective and may have to be tested at an Apple store to evaluate. Regardless you could try the following (I would not give it a high probability).
Try holding down the Home and Wake/Sleep buttons at the same time for about 15 seconds until the Apple logo appears. You will not lose anything.
If a restart does not help try a System Restore. First backup your device using iTunes. Also import your photos to your computer and copy all important data if possible. Try restoring from backup first and testing it. If it does not help, you may have to restore as New and reconfigure from scratch as the backup could be corrupted. For this reason it is important to have your photos and data saved separately from the backup. Here are the steps for a Restore:
pink and purple vertical lines
