Help! iPad shows USB cable and itunes logo.

I connect to itunes and it states I can't sync because I need to enter my password on my ipad. I can't enter my password because it only displays the itunes and USB icons. I tried just about everything I can think of to solve this problem. I have turned the ipad on and off, used the home button, volume button, etc. It woun't work. What can I do to fix this? My ipad is about 6 months old. Bought it brand new. I have synced many times without any issues.