Dell Technology Guide
Page 278
... KEY TO SHUTDOWN. THE COMPUTER IS DOCKED AND ONLY BATTERY POWER IS DETECTED. THE AC POWER ADAPTER WATTAGE AND TYPE CANNOT BE DETERMINED. YOU SHOULD UNDOCK, REDOCK, ATTACH THE POWER ADAPTER, OR PLUG IN THE POWER CORD. If the problem persists, replace the CMOS battery. Contact Dell for instructions, see "Entering the System Setup Program" on...
... KEY TO SHUTDOWN. THE COMPUTER IS DOCKED AND ONLY BATTERY POWER IS DETECTED. THE AC POWER ADAPTER WATTAGE AND TYPE CANNOT BE DETERMINED. YOU SHOULD UNDOCK, REDOCK, ATTACH THE POWER ADAPTER, OR PLUG IN THE POWER CORD. If the problem persists, replace the CMOS battery. Contact Dell for instructions, see "Entering the System Setup Program" on...