Troubleshoot Your iPad: Sync, Computer, or iTunes Issues
One category of troubleshooting techniques for the iPad applies to issues that involve synchronization and computer–iPad relations. If you’re having problems syncing or if your computer doesn’t recognize your iPad when you connect it, here are some things to try.
It's best that you try these procedures in the order they’re presented here:
Recharge your iPad.
If you didn’t try it previously, try it now. If you’re in a hurry, charge your iPad for a minimum of 20 minutes. A full charge is a better idea, but a 20+ minute charge is better than no charge at all. And for faster charging in any circumstances, turn your iPad off while it charges.
Most “powered” USB hubs, the kind you plug into an AC outlet, will charge your iPad just fine. But “passive” or “unpowered” hubs — ones that don’t plug into the wall for power — won’t cut it when it comes to charging your iPad..
Try a different USB port or a different cable if you have one available.
It doesn’t happen often, but occasionally USB ports and cables go bad. When they do, they invariably cause sync and connection problems. Always make sure that a bad USB port or cable isn’t to blame.
Always plug the iPad's dock connector into one of the USB ports on your computer itself. That’s because the USB ports on your computer supply more power than the other ports.
Restart your iPad and try to sync again.
Just as restarting a computer often fixes problems, restarting your iPad sometimes works wonders.
Even if you have an iTunes installer handy, you probably should visit the Apple website and download the latest-and-greatest version, just in case.