Ok, so a couple days ago my brother was fooling around with my iPod. When i got it back it just had the "plug into itunes" screen. I didn't have the USB cord so i had to wait a few days to get one. I finally got one today, and i tried plugging it in. Not recognized by either iTunes nor my computer. I tried downloading the latest version of iTunes, i tried restarting both my computer and iPod, and i tried putting it into DFU mode. Nothing works. Help?