Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 141

3. Secure the speaker by inserting the screw in the top screw
hole, as indicated in the illustration below.
4. Connect the speaker wires to the riser board, as indicated in
the illustration below.
The Compaq Deskpro Personal Computer supports up to five
drives internally. They may be installed in various
configurations, as shown and described in Chapter 1, "Your
Computer at a Glance."
When installing additional drives, follow these guidelines:
For optimal performance, connect hard drives to the primary
controller. Connect expansion devices, such as CD-ROM,
IDE tape, and diskette drives to the secondary controller.
You may install either a third-height or a half-height drive
into a half-height bay.
You must install one guide screw to ensure the drive will
line up correctly in the drive cage. Compaq has provided
extra guide screws, installed in the front of the computer
chassis, under the front bezel. Some options use M3 metric
thread hardware. The Compaq-supplied metric screws are
black.