Q: The screen on my iPhone 6 turns blue when I turn it on, what should I do?

Hi Homero,

If your iPhone's screen turns blue when you start it up, I would suggest that you troubleshoot using the steps in this article - 

Get help with the screen on your iPhone, iPad, or iPod touch - Apple Support

Specifically this section -

If you see a solid color screen (black, white or blue)

1. Plug in your device to a power source. If you see the low-battery screen when you plug in, let your device charge for at least 10 minutes (20 minutes for iPad) before using it.
2. Reset your device while it's plugged in.
3. If resetting doesn’t fix the issue, restore your device.
4. If you still see the issue after you restore, contact Apple Support.

Thanks for using Apple Support Communities.

Sincerely.