Compaq 500B Microtower Supplementary Manual page 38

9 To reattach the panel, align the tabs on the panel over
the corresponding slots on the computer. Slide the side
cover forward.
10 Reattach the screw at the back of the computer.
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11 Reconnect all attached cables, such as the keyboard,
mouse, Ethernet, and monitor cables.
12 Reconnect the power cord.
13 Turn on the computer and all peripherals, such as the
monitor.
14 Verify that the new add-in card is working properly.
Removing and Replacing an Add-In Card