This information says iPhone, but think iPad everytime your see iPhone (its the same steps).
Source:
- Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
- Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
- Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
- After at least 30 minutes, if:
- The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
- The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
- Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
- If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
- If the display turns on, go to step 4.
- If the display remains black, go to next step.
- Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
- If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Source: http://support.apple.com/kb/HT1476
iPhone and iPod touch have an internal rechargeable battery. Learn how to charge the battery and resolve charging issues.
If your battery doesn't charge, or if your device shows a low-battery image, black screen, or "accessory not supported" alert, follow these steps.- Inspect the connector at the bottom of the phone:
- Make sure that there are no bent pins in the connector.
- Make sure that the connector is free from debris.
- If there are bent pins or debris, please contact Apple Support.
- Otherwise, continue troubleshooting.
- Make sure that the outlet you're using works.
- Make sure that the Apple USB cable and Apple USB power adapter work.
- Plug the device in to power and let it charge for up to 30 minutes. If you don't have an Apple USB power adapter, try connecting to a computer's high-power USB 2.0 port (not a keyboard). The computer must be on.
- If the device still exhibits an issue, try turning your device off and then on again while connected to power.
- If the issue is persists, please contact Apple Support.
Battery life and number of charge cycles vary by use and settings. Find more information about batteries foriPhone and iPod.
Find information on how long the battery is expected to last between charges.
Rechargeable batteries have a limited number of charge cycles and may eventually need to be replaced.
Locate a Service location: https://locate.apple.com (choose your country in the top right)
Call Apple for Mail-in Service (if available): http://support.apple.com/kb/he57
Set up service on your own or check options: https://selfsolve.apple.com
Questions about service and potential costs: http://www.apple.com/support/service/ (Choose your country after selecting your product)