Can't hear from one or both of your earbuds, you may need to replace the headphone jack. This headphone jack is made specifically for the iPod Nano 5th Generation.
This part also includes the hold switch assembly, so if you are having trouble putting your iPod in "hold" mode, or can't get it out of "hold" mode, then this is the part you need.
Includes opening tools.
Professional installation is available.