Compaq Deskpro Workstation AP240 Reference Manual page 136

Removing the Front Bezel
6-16 Upgrading the Minitower Workstation
1. If you have locked the Smart Cover Lock, use Computer
Setup to unlock the lock and disable the Smart Cover
Sensor.
2. Shut down the operating system properly, then turn off the
workstation, and disconnect the power cord from the
electrical outlet.
3. Remove the workstation access panel.
4. Push up the two release latches on the inside of the bezel
and pull the bezel away from the workstation chassis.
Removing the Front Bezel