HT201570: Find the serial number of your iPod
Learn about Find the serial number of your iPod
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Helpful answers
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Mar 4, 2016 2:56 AM in response to kss21064by Kenichi Watanabe,Since it's out of warranty (for a long time) and even beyond Apple's servicing support, knowing the serial number won't really help you.
If you did a Reset (restart) like this
Learn how to reset your iPod - Apple Support
and it returns to the same error screen, the most likely cause is a faulty hard drive in the iPod. You can try putting it into Disk Mode
Putting iPod into Disk Mode - Apple Support
If the iPod goes into Disk Mode, run iTunes and connect the iPod. If iTunes picks it up, it may prompt you to do a Restore with a message about "recovery." A Restore erases the iPod, reinstalls its software, and sets it to default settings.
Of the iPod does not go into Disk Mode, or the Restore fails, the iPod probably has a faulty hard drive (or other hardware problem).