I was also having this problem. Now, my iPod (4th Gen) will not play any songs. When I connect it to my computer, iTunes does not recognize it, the iPod updater freezes until I unplug the iPod and then gives me a message saying unable to mount iPod. I have reset the iPod, I went into disk mode and tried connecting it, still nothing. I've noticed a clicking noise that sounds like it could be the arm of the hard drive. I tried hitting the iPod on the right side, nothing. I haven't gotten an unhappy iPod symbol or a folder with an exlamation point. Anyone have any ideas?