HP Personal Computer User Manual page 14

Component
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8 Chapter 2 Getting to know your computer
Subwoofer connector
USB 2.0 ports (2)
RJ-45 (network) jack
Hard drive light
Description
Connects HP Pulse Subwoofer (purchased separately). The
subwoofer provides superior bass sound.
Connect optional USB devices.
Connects a network cable.
Blinking: The hard drive is being used.