Damaged hardware is responsible for the most obvious iPod
sound problems. In such cases, Apple may be able to help you fix the problem,
depending on the status of your warranty.
All iPods have a one-year warranty according to Apple's
website.
Software problems can also affect your audio.
For example, downloading a non-certified Apple application
can stop your sound from working correctly.
Returning your iPod to its original factory settings fixes
many of these software glitches.
Plug in a different set of headphones and test the sound.
If that set works, your old headphones were the cause of
your audio problems.
If your iPod still doesn't work, proceed.
Remove an application on your iPod Touch if you installed it
right before your sound stopped working.
Hold your finger over the top left corner of the
application.
It will shake.
Touch the "X." Touch the "Home" button.
Restore your iPod to fix other potential software problems.
Open iTunes. Plug the iPod into your computer with a USB
cord.
Click on your iPod on the left-hand menu.
The iPod will be listed under the name you assigned it when
you first set it up.
Click the "Restore" button on the menu.
Leave the iPod alone while it restores. It may take several
minutes.
Test the sound once the restore is complete.
The iPod syncs after restoration.
Once the sync is complete, the process is over.
Contact the Apple Technical Support line at 1-800-275-2273
if your audio still doesn't work.
Have your iPod with you.
http://www.apple.com/support/contact/
iPod Video Headphone Jack Replace Hold Switch Fix Sound
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http://www.youtube.com/watch?v=slIo8PX06-s
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