The nice thing about devices with removable batteries is that fixing something that has locked up is a simple task of pulling the batteries out. Unfortunately the batteries on the iPod cannot be removed so if your device does lock up you can be in a spot of difficulty. Fortunately there is a relatively simple process to reset an iPod, just do the following:
- Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.)
- Press and hold the Menu and Select buttons until the Apple logo appears, about 6 to 10 seconds. You may need to repeat this step.
These steps were quoted from the Geekfishing Blog which also has a number of other tips on resetting a stubborn iPod.