\"OK TO DISCONNECT\" means to disconnect. It should be because there is a problem when the iPod disconnects from the computer, causing it to crash. Please try this method first: Long press the center key and the upper MENU key for about 15 seconds, and then the screen will appear Apple's LOGO, and then automatically jump back to the main menu, which has been restored. Or, you can keep the machine dead, the next day will run out of power, and then fully charged. But there may be damage to the battery.