Shut down the operating system on your Compaq Presario 5430 US computer. Disconnect the black power cable attached to the port on the back of the Presario. Remove the remaining cables for your keyboard, monitor, mouse and printer.
Set the Presario's case on a flat work surface with the right-hand side access panel facing toward you. Feel along the left side of the access panel to locate the two Phillips screws locking the panel in place.
Loosen and remove both of the Phillips screws with a Phillips screwdriver. Grab the raised edge at the left side of the access panel, and slide the panel away from the computer case.
Set the panel aside and turn the computer case so the front panel is facing you. Push in on the plastic tabs located on both the left and right sides of the front panel.
Grip the top of the front panel and pull the panel off the computer case.