alex, try to unplug your ipod hold the start button at the same time plug in your ipod. Or go into DFU Mode and restore.
DFU Mode
Connect your iPod to your computer
Turn your iPod Off
Press and hold the power button for 3 Seconds
While continuing to hold the Power button, press the home button as well for 10 seconds
While holding down the home button, release the power button for another 10 seconds
iTunes should detect the iPod in recovery mode, press OK, and restore your iPod, from this point forward you may release the buttons. If you have not reached this point, then you have not entered DFU Mode. Caution, this will delete your data.