I had that problem for a while. When I connected the iPod to the PC, the iPod would show up "Do not discoonect" but the PC would say it cannot detect the iPod. I tried restoring the iPod several times, but still to no avail. This was all done using the firewire cable to connect the two together. Then, I decided, let me see what happens if I connect the iPod using the USB cable instead, and lo and behold, have had no problems since!!!