Somehow my daughter has locked her iPod Nano. The screen asks for a 4-digit code. Fran Gilroy
As Apple points out, this feature is a "screen lock" and only stops you from accessing the user interface: it doesn't change anything fundamental. Apple says: "Connect iPod to the primary computer you use it with (the first one iPod synced with), and open iTunes. When you disconnect iPod from the computer, it will no longer be locked."
If this doesn't work, you can always reset the iPod back to its factory condition. This will delete any music and data, so make sure you have copies on the PC before doing a reset.
For full details, see the Apple support document, iPod: How to use the Screen Lock.
