If your iPod is acting funny, and you want to see whats wrong, you can do a diagnostics check. To enter Diagnostics Check mode, hold down center button and menu, till the apple logo appears. Then before the logo goes away, hold down center button and previous, then the screen will turn green. This will come up:iPod Diagnostics BuildID: **** (Apple Logo)SVC (The Date) V. ****>Power Sleep Audio Video LCD IO Memory TouchWheel AboutTo move to a different selection, press previous or next. Move to a sub menu with the center button. To exit, go into the power sub menu, then select Reset. I have only tried this on a iPod 3rd Generation Nano.