iPad Mini - problem syncing with iTunes

I've a problem syncing my iPad Mini with iTunes. I've a Macbook Pro 10.8.2 and also iTunes 11.0.1. Everything seems to be right. At the bottom line "how many GB is left", video and music shows sometime, but disappear when I try to sync. I've turned everything on and off a billion times now, try only to syn music, but nothing works. Can anybody please help me?