HP Compaq Presario,Presario 8380 Supplementary Manual page 42

Removing the Right Side Panel
You'll need to remove the right side panel in order to
add memory, insert add-in cards, or change the
battery.
To remove the right side panel:
1
Make sure the back panel is removed.
2
Supporting the front edge of the panel, grasp the
rear edge of the panel and pull toward the back
of the computer.
3
Lift the side panel upward and out.
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