There are several reasons an iPod won't show up in iTunes. And not so uncommon. A great place to start is on www.apple.com/support - there you can type yor question in the support "Search" box and it's fairly easy to find Apple's iTunes troubleshooting guide as to why your iPod won't show up. With a little luck, you might find one of their suggestions helpful and once your iPod shows up in iTunes, you can get on with the " Restore" process which will wipe and re-install the iPod's operating system software. Oh... and will remove all your songs from your iPod as well. Best wishes!