Compaq Evo D310 MT Hardware Reference Manual page 14

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Hardware Reference Guide
CAUTION: Before removing the computer access panel, ensure that the
computer is turned off and that the power cord is disconnected from the
electrical outlet.
3. Loosen the captive thumbscrew 1 that secures the access panel to
the computer chassis.
4. Slide the access panel 2 back about 1 inch (2.5 cm), then lift it
off the unit.
You may lay the computer on its side to install internal parts. Be sure
the side of the access panel with the pull grip is facing up.
Removing the Computer Access Panel
Hardware Upgrades
2–3