I'm not incredibly familiar with this specific model of iPod (I do have a trusty 5th gen iPod video though...), but one of the things that comes to mind is that there could be some dust or gunk stuck in the headphone jack. Maybe take a peek into the jack and see if it looks clear. These iPods should also play audio from the dock connector, so if you have an old radio or iHome, you could test to see if the dock connector audio works. iFixit has a [[iPod 4th Generation Troubleshooting|page|new_window=true]] here with some additional suggestions for troubleshooting.
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I'm not incredibly familiar with this specific model of iPod (I do have a trusty 5th gen iPod video though...), but one of the things that comes to mind is that there could be some dust or gunk stuck in the headphone jack. Maybe take a peek into the jack and see if it looks clear. These iPods should also play audio from the dock connector, so if you have an old radio or iHome, you could test to see if the dock connector audio works. If that works and the jack doesn't, then it's very likely there's an issue with the jack or the cable inside the iPod that goes to it. iFixit has a [[iPod 4th Generation Troubleshooting|page|new_window=true]] here with some additional suggestions for troubleshooting.
The good news is that parts for this iPod are still easy to find and relatively cheap, good luck!
I'm not incredibly familiar with this specific model of iPod (I do have a trusty 5th gen iPod video though...), but one of the things that comes to mind is that there could be some dust or gunk stuck in the headphone jack. Maybe take a peek into the jack and see if it looks clear. These iPods should also play audio from the dock connector, so if you have an old radio or iHome, you could test to see if the dock connector audio works. iFixit has a [[iPod 4th Generation Troubleshooting|page|new_window=true]] here with some additional suggestions for troubleshooting.
The good news is that parts for this iPod are still easy to find and relatively cheap, good luck!