iPhone/iPod/iPad is not docked/connected properly: - Remove your iPhone/iPod/iPad from the dock and check for obstruction on the connectors in the dock and on your iPhone/iPod/iPad. Then reseat it in the dock. Make sure the device is properly connected to the USB cable and to the USB port on the unit.
iPhone/iPod/iPad is locked up or Frozen / iPhone/iPod/iPad battery has problem: - Please make sure your iPhone/iPod/iPad is working properly before docking into the unit. Refer to your iPhone/iPod/iPad manual for details.
iPad is connected to USB port: - The USB port will not charge iPad models. To charge iPad with 30-pin connector, dock it in the 30-pin dock. To charge iPad model with Lightning connector, charge it using the charging cable that came with it.