Sony PCG-GR390K - Manual (Page 57)

Connecting a Port Replicator
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4 Align the bottom connector of the notebook with the connectors on the port
replicator and push down until it clicks into place.
5 Turn on the notebook.
To remove your notebook from the port replicator
1 Use the Unplug/Hardware box to stop all connected peripherals, then
disconnect the peripherals from the port replicator.
2 Pull the levers on each side of the port replicator to release the notebook
from the port replicator.
Attaching notebook to port replicator
Releasing notebook from port replicator
Notebook
Port replicator
Levers