Sony PCG-GRX500K - Manual (Page 102)

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3 Click the Settings tab, and then click the Advanced button. The “(Multiple
Monitors) and Mobility Radeon Properties” dialog box appears.
4 Click the Displays tab and select the display settings by clicking the
icon on the panel of your display choice. For more information, click the
Help button.
(Multiple Monitors) and Mobility Radeon Properties screen
✍
If you cannot see your movie or DVD on the external display, change the monitor or TV
setting by clicking on the Secondary
icon and changing it to Primary .