Compaq Deskpro Workstation AP240 Reference Manual page 116

5-28 Upgrading the Desktop Workstation
2. Using the Smart Cover FailSafe Key, remove the tamper-
proof screws securing the Smart Cover Lock to the chassis.
Removing the Smart Cover Lock Screws
3. Remove the workstation cover.
To reattach the Smart Cover Lock, secure the lock in place with
the tamper-proof screws.
Reattaching the Smart Cover Lock