iPod Classic will not show up in iTunes

Okay. I'm sure this has been posted somewhere before, but I don't have time to surf through all those posts, so here's my problem. I had an old MacBook with an iTunes account and my iPod Classic would sync up to it just fine. Now I am using someone else's iMac and my iPod will not show up in iTunes. The iMac recognizes my iPod; the icon for it will show up on the desktop. iTunes also somehow recognizes my iPod, because when I hook it to the usb, iTunes automatically opens up. I have tried uninstalling iTunes and re-installing it (twice) via the steps you get from Apple support. I've also tried misc. other tips apple gives you, and to no avail. I'm tired of trying the same old thing- nothing ever works!! Any suggestions???? Thanks!