TBH, this isn't my "area of expertise", but if it were me, I'd try pluggin the second I tunes into a different USB slot, one that hasn't had the original Ipod plugged into it. I've seen crazy things when it comes to devices attached via USB.
If this doesn't work, post back and some one else will try to help you.
Hope this helps (and good luck!)!!!!!
War produces veterans, wounded both physically and mentally. They have sacrificed for us.....and it is now our job to help these veterans, as they have already helped us in ways we will never know, in ways that we cannot fathom, and in ways that we take granted every day.