Removing The Computer Access Panel - HP ProDesk 400 G4 SFF Hardware Reference Manual

Removing the computer access panel

To access internal components, you must remove the access panel:
1. Remove/disengage any security devices that prohibit opening the computer.
2. Remove all removable media, such as compact discs or USB flash drives, from the computer.
3. Turn off the computer properly through the operating system, then turn off any external devices.
4. Disconnect the power cord from the power outlet and disconnect any external devices.
CAUTION:
the system is plugged into an active AC outlet. You must disconnect the power cord to avoid damage to
the internal components of the computer.
5. Loosen the thumbscrew on the rear of the computer (1), slide the panel back (2), and lift if off the
computer (3).
Regardless of the power-on state, voltage is always present on the system board as long as
Removing the computer access panel 5