I have always used the same computer and USB to upload music on to my phone. For some reason, last night when I plugged my phone into my computer nothing happened, not even the initial sound. I looked up everything on here and nothing seems to exactly match my problem. This is the same USB that I use to charge my phone, and it works. All the USB controllers that show up in device manager say that they are in fact working, however I am not sure if this particular USB is on the list. Please help!!