HP Compaq d330 ST Hardware Reference Manual page 59

Hardware Reference Guide
3. On the top of the computer, locate the cover latch. Pull up and
hold the latch 1 to release the computer access panel.
4. Slide the computer access panel back 2 about 0.5 inch (1.25 cm),
then lift the access panel up and off the chassis.
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Port Security Bracket
E-3