Hit the center button followed by the play button to put it in disc mode.
Connect the iPod to your computer to revive it. ITunes will recognize that it is in recovery mode and advise you to restore it. Choose "Restore."
Wait for the process to finish. Depending on the amount of content you have on your iPod, this may take a while. When the iPod is restored, it will be fully functional again.
As popular as iPods have become, they have never been known for their reliability. Outside of random lock-ups, a common issue with iPods is that they choose not to boot properly (or at all). Getting your iPod to access iTunes will allow you to fix most booting problems.
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