Sony PCG-GRX500K - Manual (Page 72)

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Regardless if you use the port replicator or the notebook to connect an AV
device, you will need to switch the TV input channel to external input and set up
the TV configuration system. See “Selecting the Display Mode” for more
information.
To change the display
If you insert a DVD in your optical drive to watch on your TV, the Fn+F8 key
combination might not activate the function to toggle between your LCD and TV.
Follow the procedure below.
1 Connect the TV to the notebook.
2 Restart the notebook and wait until it finishes rebooting.
3 Use the Fn+F8 key combination to toggle between the LCD and TV display.
The DVD will play on only one display at a time, so select either LCD or TV
as the primary display. See “Selecting the Display Mode” for more
information.
4 Re-insert your DVD to launch your DVD software.
✍
See the manual that came with your AV device for more information on its installation
and use.