Installing An Optical Drive Into The 5.25-Inch Drive Bay - HP Compaq Pro 4300 Small Form Factor Reference Manual

10. Slide the drive back until it stops, then lift it up and out of the drive cage.
Figure 2-22
NOTE: When replacing a drive, transfer the four mounting screws from the old drive to the new one.

Installing an Optical Drive into the 5.25-inch Drive Bay

To install an optional 5.25-inch optical drive:
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:
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.
5. If the computer is on a stand, remove the computer from the stand.
6. Remove the access panel.
7. If you are installing a drive in a bay covered by a bezel blank, remove the front bezel then
remove the bezel blank. See
30 Chapter 2 Hardware Upgrades
Removing the 5.25-inch Drive
Regardless of the power-on state, voltage is always present on the system board
Removing Bezel Blanks on page 11 for more information.