Ipod nano white screen brand new

Just bought a 7th Generation Ipod nano and tried to plug it in and load music on it. When it was done syncing it said ok to disconnect so I did so.
After I unplugged it, there was a white screen that had a lock symbol in the top left corner and it wouldnt do anything. I reset it by holding in the center button and top button. Once it reset it said connect to Itunes to restore. I plugged it into my computer and the white screen came back and says do not disconnect. Not sure where to go from here. I have the latest version of Itunes downloaded and when I plug the Ipod in nothing connects or shows up in my itunes for it.