Well the first logical thing to try is a different pair of headphones.
I've heard that some of the iPod's kill their headphones (I believe it was the gen 5 and the right side that it had killed)...
Anyways, try another pair of headphones.
If you're still having problems, you'll have to go to the apple store. Depending on how long you've had the ipod, you may have to pay $29.95 for service (after the first 6 months from purchase due to shipping and handling fees)
I've heard that some of the iPod's kill their headphones (I believe it was the gen 5 and the right side that it had killed)...
Anyways, try another pair of headphones.
If you're still having problems, you'll have to go to the apple store. Depending on how long you've had the ipod, you may have to pay $29.95 for service (after the first 6 months from purchase due to shipping and handling fees)