HP Compaq Presario,Presario 2105 Reference Manual page 69

3. Align the notebook with the locator posts on the port
replicator.
4. Press the notebook down until it snaps into place.
5. If the notebook is off, open the notebook and press the power
button to turn it on. The lights on the port replicator turn on.
When the notebook is docked, you can use the notebook security
connector to secure the notebook. To secure both the notebook
and port replicator, install the cable lock in the security connector
next to the undock button. This will also lock the undock button.
✎
If a device is connected to an audio port on the notebook, any
device connected to the corresponding port on the port replicator
is ignored.
Reference Guide
Add-On Devices
5–9