I have an apple computer and I have my iPod hooked up. I have had no problems up until now. My iPod was wiped out and now when I hook it up it appears as an icon and does not show up in itunes where it usually does. Can you help?

Here are a couple of resources that should help. The Apple iPod troubleshooting Assistant. Select your model and follow the steps. And how to reload your iPod to factory settings.