Sony PCG-GRX580P - Manual (Page 82)

To connect a computer display to the notebook
1. Shut down the computer before you connect the computer display.
2. Locate the VGA (Monitor) port on the rear panel of the notebook or port replicator.
3. Plug the display cable (not supplied) connector into the VGA (Monitor) port.
4. Verify that the power cord is plugged into the computer display and an AC outlet.
Connecting an External Computer Display to the Notebook
Note:
See the manual that came with your computer display for more information on its installation and use.
Page 82