Ipad is charged will not turn on

Apple support suggests several possibilities. The iPad may not be receiving sufficient power to charge it; some lower powered charging devices are lacking. The charger may not be Apple certified (as being adequate). Test an alternative charger. Or, the port may be dirty or damaged. Remove debris. Try another USB cable. Restart the device. Also, determine whether or not you have the latest ios operating system. If it still does not charge, contact Apple support for service.

For more detailed instructions: https://appletoolbox.com/ipad-air-charging-very-slowly-or-not-charging-fix/

Plug it in to the AC outlet via a charger.
Wait for an extended period of time...then try to turn it On.

Does your iPad turn on ?
If so, what is the battery level shown by the battery icon at the top of the screen ? Does it have a lightning bolt in the middle, showing that it is charging ?

if nothing happens, your iPad battery may be dead.
Take your iPad to an Apple astore to have it replaced.

Incorrect port part, Wrong polarity for wires connected to the port or poor connection of wires to the port.

Do you mean that once it's charged and off the charger, the iPad won't turn on? Your battery is no good.

if you know the power cable is good? (aka they will charge some other ipad) then it's either your battery or the cable connector.

First steps: Make sure you're up to date

1. Verify you have installed the latest version of iTunes.
2. Verify that you are connecting iPad to your computer using a USB 2.0 port.
3. Make sure your iPad software is up to date: With your iPad connected to your computer, click "Check for Update" in the Summary section of iTunes.
4. Charge your battery: Using the USB power adapter that came with iPad, charge iPad for at least 20 minutes before further troubleshooting. If necessary, refer to "Charging the Battery"

With iPad Magic, you can transfer photos, videos, music, books, etc. between iPad, iTunes and computer at ease. Moreover, it also enables you to convert audio and video files, rip CD and DVD discs, download online videos, make ringtones and more. Also, it works well on iOS 7 and iTunes 11.

http://www.youtube.com/watch?v=8ALYybIAL3k

Supported iOS Devices:
iPad, iPad 2, The New iPad, iPad mini, iPad with Retina display;
iPhone 3G/3GS, iPhone 4/4S, iPhone 5, iPhone 5C, iPhone 5S

There are many things you might be doing wrong but slow battery charge is a problem with the new iPad. The battery is actually a lot bigger than the iPad 2 which means it is going to take you much longer to charge.
Use the provided charger and don't charge from your computer. It is almost twice as slow to do it plugged into a computer. Charge it at night to give it the most time to charge as possible. I usually turn it off so programs don't run and slow down the charging speed. Every little bit helps.
I can help you with other things too if you ask.

the ipad will charge with the charger that comes with it

if you want to charge it with the cpu you have to turn off the ipod before it will charge

Press and hold sleep /wake button

til it says slide to power off

Hold the on switch and menu button together for a hard reset. If you can reset it, there may be an issue with your motherboard. If apple doesn't replace it for you, You can get the board at iPad Repair and there is a guide that shows you how to put in the part at Electronics Repair Guide.