Q: Ipod screen is frozen

Help! My son was playing a game on our Ipod touch when he thought he could down load a new game and instead he froze my screen.. Im taking it he was messing around in the itunes because the itunes logo is on my screen with a picture of a usb cord showing me to plug a usb cord in to itunes. I have held down my bottom button and nothing I can not turn off mt ipod because our top button got stuck last week and we tryed to get it unstuck and now it wont do anything as far as shutting down the ipod. Please can you tell me what I can do to get it working again.. I was going to just let the ipod die then hopefully when I got to charge it, it will reset and the itues logo will go away.. Thanks!