My nano 3g ipod, when i plug it in to the computer, my computer does not recognize it. Instead of the ussual noise it makes when i plug it in, it makes a quick, repeated 4 or 5 beeps. It charges my ipod, but it will not update it. The small ipod does not appear on the left side of itunes when i plug it in. I have tried restarting my ipod and computer. It didn't work. I tried using different ipod cords to connect it to my computer. Didn't work. I tried plugging it into diffent USB spots on my computer didn't work. Help! Please!