my ipad 3 is not charging when plugged to pc, and it wouldn't sync in itunes as well, it's been like this since I first got it. it does charge when it's plugged into a wall with a 10W power adapter
iPad
Most computers don't have enough power to charge the iPad. It will do it but very slowly. You need to use the wall charger.
From here :
The fastest way to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter. When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge, but only when it's in sleep mode.
For syncing, is iTunes on your computer the latest version ? There is some troubleshooting on this page.
my ipad 3 is not charging when plugged to pc
