Compaq Deskpro Workstation AP240 Reference Manual page 90

5-2 Upgrading the Desktop Workstation
3. Disconnect the power cord from the power outlet.
4. Press in the cover latches on the sides of the desktop
workstation toward the front of the workstation.
5. Slide the cover forward about 1 inch (2.5 cm), then lift it
up and off the unit.
Removing the Desktop Workstation Cover
CAUTION:
After replacing the cover, be sure the green cover
latches are securely latched before lifting the workstation.