We have been getting a lot of emails on this so here is the answer on why your lightning cable may not be working with your iPad 3/4. The standard usb power adapter that comes with your iPhone, iPod and iPad Mini will not work with the charger cable on your iPad 3rd and iPad 4th Generation. The adapter that came with your iPhone, iPod and iPad Mini is a 5W adapter and the iPad 3rd/4th Gen requires the original 10W adapter that came with it. If you use the 5w adapter with the charger or lightning cable it will not charge the iPad and will not show the charging symbol. Make sure you are using the correct iPad wall charger with the charger cable for the iPad 3/4 generation to resolve this issue.