The official Apple support website hosts comprehensive instructions for troubleshooting iPod issues. Many of the third-party websites that offer repair services or sell iPod parts, such as GeekSquad and iFixit, also provide free instructions for identifying and fixing minor issues with Apple products.
Apple support channels provide troubleshooting instructions for all iPod models along with official support and repair services. An owner should check whether an Apple warranty covers the device before considering third-party solutions or attempting risky fixes himself. Note that troubleshooting guides are usually specific to each iPod generation. The Apple support website has instructions for identifying specific iPod models.