Removal And Replacement Procedures: Microtower; Preparation For Disassembly - HP ProDesk 400 G1 Maintenance And Service Manual

5 Removal and replacement
procedures: Microtower
Adherence to the procedures and precautions described in this chapter is essential for proper service.
After completing all necessary removal and replacement procedures, run the Diagnostics utility to verify
that all components operate properly.
NOTE: Not all features listed in this guide are available on all computers.
NOTE:
HP continually improves and changes product parts. For complete and current information on
supported parts for your computer, go to http://partsurfer.hp.com, select your country or region, and
then follow the on-screen instructions.

Preparation for disassembly

See Routine care, SATA drive guidelines, and disassembly preparation on page 33
procedures.
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:
Regardless of the power-on state, voltage is always present on the system board as long as the
system is plugged into an active AC outlet. In some systems the cooling fan is on even when the
computer is in the "Standby," or "Suspend" modes. The power cord should always be
disconnected before servicing a unit.
5.
As applicable, lay the computer down on its side to achieve a safe working position.
NOTE:
Keep all screws with the units removed.
CAUTION:
wrong screw in an application may damage the unit.
42 Chapter 5 Removal and replacement procedures: Microtower
Turn off the computer before disconnecting any cables.
During disassembly, label each cable as you remove it, noting its position and routing.
The screws used in the computer are of different thread sizes and lengths; using the
for initial safety