iMac to Ipad syncing

Since recent iTunes update my iMac no longer syncs with my iPad. I have tried Bluetooth and cable connection between iMac and iPad but the iPad symbol no longer appears in iTunes so am not able to apply the sync. It is very frustrating as the calendars sync automatically between the two units. I want to add photos from iPhoto on Imac to iPad. Previously this has easily happened but now without the iPad symbol appearing in iTunes, I cannot do any transferes. Anybody with ideas please