I was using my Ipad playing games and the screen just went black, the battery had over 80% life left can not turn on

One suggestion online is to press the sequence of buttons shown in the article below:

https://mashable.com/2015/11/20/apple-ipad-pro-screen-black/#coWqk0nqv8qB

Quoting:

"Learn what to do if your iPad Pro doesn't respond when you press buttons or tap on the screen, and the screen is black," Apple's message reads. "To get back to using your iPad Pro, force restart it by pressing and holding both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo."

You will need to go to the game makers for a fix.

The app is crashing. Make sure that you have no other apps open in the background as they drain your iPad's processor speed, and that you have at least 1 or 2 GB open in storage as that will help as well. If you haven't in a while shut the iPad all the way off for a minute and then turn it back on. Sometimes that will also help to clean it up and perform better. Make sure your operating system is completely up to date as well. If that doesn't help then the app is just too much for your iPad to run properly.

And while the iPad may have a fairly long battery life, you're still going to need a few tips on how to keep it lasting as long as you can. Here are some hints on how to perverse the iPad between charges:

In the "settings" folder there is an option to turn down the screen brightness. Keeping it down a little won't ruin your experience and will help prolong life.
Turn off 3G and WiFi services when they aren't needed. You'll only need them when connecting to networks or downloading/browsing data, so turn them off when you can.
Make sure apps aren't running in the background when they don't have to. Turning apps off from the multitasking tray can save you some juice.
Run the battery out every few weeks. Giving the iPad a full charge will ensure it remains in good condition.
Turn the screen off. When you aren't using your iPad, then turn the screen off and don't waste any unnecessary power.
More Information:http://www.agptek.com/Maximise-your-iPad-battery-life_109_1.html

This would be a hardware problem in LCD. You may be required to change it or the LCD flex cable may be causing it. That requires an expert technical to check or install it. Other than that you are fully responsible opening your iPad . Which I do not recommend because you may damage other parts. Check YouTube for the error to see if it solves it

Try reseting the iPad by holding the home and power buttons simultaneously until the iPad completely shuts down and the Apple logo appears.


Once the Apple logo appears you can release the buttons. If this does not work, you may need to connect your iPad to your computer and do a factory restore using iTunes.

How long does your battery last? Are you playing a lot of games on it?
There are many situations we need to know before we can help you fully diagnose your problem. Until you provide us with that we can't give you anything other than basic advice.
Here is the basic advice to help improve your iPad's battery life. Please provide more details so we can be more specific as well.

• Turn down screen brightness
  
• Don't play graphics heavy games
  
• Turn off location services
  
• Quit applications you are not using
  
• Turn off push notifications
  
• Set email to manual update
  
• Don't use 4G internet connection if possible
  

Here are two articles that should help you:
http://howto.cnet.com/8301-11310_39-20088870-285/10-ways-to-improve-ipad-battery-life/
http://howto.wired.com/wiki/Improve_Your_iPad's_Battery_Life

I just answered this for someone else. You can see how to improve your battery life here.
Since I'm nice I will post here too.

• Turn down screen brightness
  
• Don't play graphics heavy games
  
• Turn off location services
  
• Quit applications you are not using
  
• Turn off push notifications
  
• Set email to manual update
  
• Don't use 4G internet connection if possible
  

Here are things that help.

• Turn down screen brightness
  
• Don't play graphics heavy games
  
• Turn off location services
  
• Quit applications you are not using
  
• Turn off push notifications
  
• Set email to manual update
  
• Don't use 4G internet connection if possible
  

For charging do these things.

• Use charger that came with the new iPad
  
• Don't charge with USB outlet on computer always plug into a wall
  
• Quit applications you are not using