To rule out a faulty USB docking cable that is not providing power to the iPod, try another cable (if you have one). If the cable is not the problem...
Does "re-setting to iTunes" mean you did a Restore on the iPod. This procedure?
Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support
If you just did a Reset (restart), by pressing and holding the Menu and Center buttons
Learn how to reset your iPod - Apple Support
try putting the iPod into Disk Mode
Putting iPod into Disk Mode - Apple Support
If the battery is low, you can do this while iPod is connected to power. Run iTunes and connect the iPod to a direct USB port on the computer. If iTunes picks it up, it may prompt you to do a Restore. If you're OK with erasing the iPod, do the Restore.