Okay so my IPod touch 4 won't play music through any headphone I put into the port. I've tried it with 4-5 different headphones but it still won't work. How can I fix this?

Question

Okay so my IPod touch 4 won't play music through any headphone I put into the port. I've tried it with 4-5 different headphones but it still won't work.  How can I fix this? This isn't the first time something like this has happened but it has never stayed this way for such a long time. If I have to send it in for repairs I will but I'm not sure if its under warranty

Answer 1

To check for warranty coverage:
https://selfsolve.apple.com/agreementWarrantyDynamic.do
- Try cleaning out/blowing out the headphone jack. Try inserting/removing the plug a dozen times or so. There is a little switch in the headphone jack that disconnects the speaker when the headphone jack is inserted.
Try the following to rule out a software problem
- Reset the iOS device. Nothing will be lost
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup
- Restore to factory settings/new iOS device.
- Make an appointment at the Genius Bar of an Apple store. Seems you have a bad headphone jack.
Apple Retail Store - Genius Bar
If not under warranty Apple will exchange your iPod for a refurbished one for $199 for 64 GB 4G and $99 for theother 4Gs. They do not fix yours.
Apple - iPod Repair price                  
A third-party place like the following will replace the jack for less. Google for more.
iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens
Replace the jack yourself
iPod Touch Repair – iFixit