Sony PCG-GR250 - 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 Turn off your notebook and the connected peripherals.
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