Step 34
Grasp the upper plastic casing where it locks into the internal frame and pull back. When the plastic tab has cleared the slot that the casing locks into, pull up enough to keep it from locking back into place.
Step 35
The PC card eject button on the laptop's left side prevents the upper casing from lifting up. In order to bypass the button, push it in far enough so that you can pull the upper casing's left side out and up beyond the button.
Step 36
Lift the left side of the case partly up so that you can access and disconnect the audio in/out cables from the sound card in the upper right of the case.
Be careful not to lift the upper casing too far before you have disconnected the audio in/out cables or you may damage the sound card.