I have the same issue as yours, 3rd gen that when put on any type of charger, dock, AC or DC switches from apple icon to charging icon, but won't turn on. When unplugged mine stays on the apple icon until it shuts off. I dropped mine, but caught it by the docking cord. I'm pretty sure I jacked up my charging dock. Either send it in to Apple, or another company that will fix ipods. There are also a ton of internet and youtube tutorials on how to replace it. It is risky though if you aren't good with tools or have steady hands. Any screw up could cause a ribbon to be damaged and then you are up a creek.