stuck in recovery mode

My ipod was fully functioning as of this morning, but it was not recognized in iTunes. So I put it in recovery mode and tried to restore it in iTunes - iTunes recognized the ipod but did not restore successfully, gave me error 2003.

Now it is stuck in recovery mode - forever. I've used usblib, dfu mode, redsn0w, and iReb. The closest it got to working was with redsn0w, when the screen changed to a green arrow on a hard drive with "downloading jailbreaking data" under it. But the ipod just restarts after 10 minutes in recovery mode again.

What on earth can be done?