With no sound, here's a good troubleshooting system:
# check the iPod with another pair of headphones or speakers, just to make sure that your first ones aren't the problem.
# [guide|562|replace] the headphone jack assembly (there are different assembly for the [product|130001|80/120/thin 160 GB] and the [product|130013|thick 160 GB], which is why it's good to know more information about your iPod).
# If replacing the headphone jack doesn't solve the problem, all signs point to the [product|130006|logic board].
Good luck!