I have the same exact problem too. I took it to Apple, and the volume was working at the time (because the volume sometimes comes on for a minute or so) and the said that there was nothing wrong with it. ( they have terrible customer service). now that I'm hearing it's a moisture problem, I suggest blow drying it. if you take a blow dryer and put it by the dock it would probably get all the dust out too. I had a moisture problem with my TV, and blow drying it helped I hope its the same with this! I'm going to try it now. GOOD LUCK!