Looks like the iPod is frozen
Just need to reset the iPod its a simple troubleshooting step
Toggle the hold button ( you will find the hold button on top left corner of the iPod ) back and forth for three to four times make sure you don't see the red colour on the hold switch...
Once that is done place the iPod on a flat surface and press and hold the menu and the middle button at the same time untill you see a Apple logo on the iPod screen, once you see the logo let go the buttons and the iPod will restart itself and the iPod should work after that
If that doesn't resolve the issue then you might need to restore the iPod using iTunes ( if the ipod is showing up in iTunes ) and the link for that would be
http://docs.info.apple.com/article.html?artnum=60983
if that does not fix the issue then the iPod would need a service