Symptom
If you shake iPod, the Hold switch and hard drive make a rattling noise.
Solution
iPod is well constructed, but if you shake it you may hear some rattling noises that come from the Hold switch and the hard drive. This is not unusual, however, you should not needlessly or carelessly shake it.
If iPod does not work and you hear a rattling noise, follow the troubleshooting steps in technical document 60942: "
iPod: Does Not Turn On."