HP Compaq Presario,Presario 2100 Reference Manual page 62

Note
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.
To dock to the port replicator
1. Plug in the AC adapter, and then connect it to the back of the port replicator. You
can also operate the port replicator using power from the notebook battery.
2. Remove the rubber cover from the docking connector on the bottom of the
notebook.
3. Align the notebook with the locator posts on the port replicator.
4. Press the notebook down until both sides snap 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 Kensington
lock in the security connector next to the undock button. This will also lock the
undock button.
Add-On Devices
Connecting External Devices
Reference Guide 55