iPad not showing up in iTunes even after performing all the usual remedies

have you tried the steps here? http://support.apple.com/kb/TS1538?viewlocale=en_US

iPad not appearing in iTunes

http://www.apple.com/support/ipad/assistant/itunes/

iOS: Device not recognized in iTunes for Mac OS X

http://support.apple.com/kb/TS1591

iOS: Device not recognized in iTunes for Windows

http://support.apple.com/kb/TS1538

How to restart the Apple Mobile Device Service (AMDS) on Windows

http://support.apple.com/kb/TS1567

IOS: Syncing with iTunes

http://support.apple.com/kb/HT1386

Apple - Support - iPad - Syncing

http://www.apple.com/support/ipad/syncing/

 Cheers, Tom 😉