HP Pavilion Slimline s5220f Supplementary Manual page 36

3 Align the tabs on the bracket cover with the slots on
the back of the computer and replace the bracket
cover.
4 Insert and tighten the bracket cover screw.
6
5 Insert the bottom of the side panel into the slots in the
computer rail, and then swing the panel down onto
the computer.
6 Slide the panel toward the front of the computer until
there is no gap.
7 Set the computer upright.
— Removing and Replacing an Add-in Card
537497-001