Why isn't my iPod recognized by my computer?

I have a 2nd generation iPod nano 4GB. When I plug in in to my computer, there is no response. iTunes doesn't pop up, the iPod doesn't charge, and windows explorer and the device manager do not recognize it as an iPod, mass storage device, or unknown device. The only thing that happens is that the iPod lights up when I plug it in. I've tried three different iPod USB cables and both USB ports. I tried putting the iPod in disk mode, resetting it, and restarting my computer. I also re-installed iTunes and tried a different computer. Other iPods work on this computer without problems. I followed many troubleshooting guides on the Apple website with no success. Please help!