Answer to: No audio after replacing headphone / hold jackIt sounds like the audio processor is bad. The audio processor is located in the bottom right corner of the iPod between the click wheel and the bottom corner. Try playing music using the headphones while squeezing the face plate and the metal back at bottom right corner. You will likely hear some audio. Unfortunately this audio processor is not replaceable unless you know how to deal with the microscopic connections. Try to find another 5th Gen with a malfunctioning hard drive and use the logic board as a replacement. Hope this helps. Good luck.