Do you see green bar, I mean do you see that it's charging?
1. connect the ipod to a computer or charger
2. press and hold the power button for 10 sec
3. press home button for 10 seconds, do not release the power button yet
4. after 10 seconds release the power button, keep pressing the home button
5. when you hear a sound, release the button and wait.
6. itunes will tell to restore it, do not do anything.
7. just wait 10 minutes in order to allow the battery to charge, then press the power button or press it for a few seconds
8. the iPod will restart, all should be normal, no data loss