iPod Classic - No Audio
Your iPod turns on and appears to work, but when you plug in headphones or speakers, the audio doesn't play properly.
Bad headphones/speakers
It's unlikely your headphones or speakers are bad, but it's worthwhile to eliminate these as the source of your problem at the beginning. Try your iPod with another set of headphones or speakers just to make sure that the problem is with the iPod.
Bad audio jack
The most likely cause of audio output problems on iPods is a bad audio-out jack. We sell the thin and thick headphone jacks, and we offer free guides for replacement.