HP Compaq NX9000 Reference Manual page 60

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Note
When you plug a device into the headphone port, the built-in speakers automatically
turn off. When you plug a device into either audio port on the notebook, any device
connected to the corresponding port on the port replicator is ignored.
Audio out (headphones) connector (green)
External microphone connector (pink)
Add-On Devices
Connecting External Devices
Reference Guide 51