Before you start, read Important safety information and print the following instructions.
Disable the built-in battery. See Disable Fast Startup and the built-in battery.
Turn off the computer and disconnect the computer from ac power and all connected cables.
Close the computer display and turn the computer over.


Turn the computer over. Connect the ac power adapter and all disconnected cables to the computer.
If the computer does not start up after you reinstall the base cover assembly, disconnect the ac power adapter and then reconnect it to the computer.