Charging iPad

If you have follow the steps contained here, If your iPhone, iPad, or iPod touch won't charge - Apple Support then you need to make a Genius Bar appointment to have the device checked. Bring the iPad, power adapter, and the cable with you.

This started happening to my devices. All will charge when connected to a Mac, but nothing else works

If your power adapters are not working, then you need to replace the power adapters.