My GF's son has a PC and a Nano. Everything has been working fine, but just recently, he said that the Nano no longer is recognized by the computer. I have tried it on my PC, and my system sees it with no problem at all. Any thoughts on why the PC/USB chain would suddenly not recognize this Nano? I haven't had a chance to look at the computer setup yet but I am open to any thoughts as to where to start. I guess it could be a bad USB port. I can't thiink of any other ports that would look like a USB port but not be.