HP ProOne 400 G2 20 inch All-in-One HP ProOne 460 G2 20 inch All-in-One HP ProOne 480 G2 20 inch All-in-One - Maintenance & Service Guide

7. Remove the two Torx screws (2) that secure the board, and then rotate the board up and remove it from
the computer (3).
8. Remove the serial/PS2 board from the computer.
To install the serial/PS2 board, reverse the removal procedures.
Serial/PS2 board 53