I've got a 40GB 4th Gen iPod, that I would like to salvage the music off of and move it to a new iPod. It appears to be functional as far as pulling up a play list. When I plug it into my MBP, it seems to charge, but the charge bar does not appear to fill up, should it? It does not appear in iTunes as a device that can be backed up. Any suggestions on how to access the music on this device to back it up to a new iPod? It's possible that I have an old music library floating around on my computer somewhere, I'll look for it. Thanks!