After working with parts, you need to replace the computer cover and reconnect any cables, including telephone lines and power cords. Also, depending on the part that was replaced, you might need to confirm the updated information in the Setup Utility program.
Ensure that all components have been reassembled correctly and that no tools or loose screws are left inside your computer.
Reposition any cables that might impede the replacement of the cover.
Close the computer cover.
Install any locking devices such as a padlock as necessary.