Replacing The Optical Disc Drive - HP ProOne 400 G1 All-in-One Hardware Reference Manual

Replacing the optical disc drive

The optical disc drive is located above the hard drive on the left side of the computer (when viewed
from behind).
1. Remove all removable media, such as optical discs or USB flash drives, from the computer.
2. Turn off the computer properly through the operating system, then turn off any external devices.
3. Disconnect the power cord from the power outlet and disconnect any external devices.
CAUTION:
as long as 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.
4. Remove/disengage any security devices that prohibit opening the computer.
5. Place the computer face down on a soft flat surface. HP recommends that you set down a
blanket, towel, or other soft cloth to protect the bezel and screen surface from scratches or other
damage.
6. Turn the two screw latches at the bottom of the computer to the left (1) to release the bottom
edge of the access panel.
38 Chapter 2 Hardware repair and upgrade
Regardless of the power-on state, voltage is always present on the system board