Sony VGN-X505VP Hardware Manual page 32

Hardware Guide
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If you see video but cannot hear sound, check all of the following:
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Make sure the mute setting is off on your DVD player.
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Check the Master Volume settings of the Sounds and Audio Device Properties.
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If you have connected speakers externally, check the volume settings of your computer speakers and check the connections
between your speakers and the computer.
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In the Device Manager, check that the correct drivers are installed properly. To display the Device Manager, click Start,
then Control Panel. Double-click the System icon. On the Hardware tab, click the Device Manager button.
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A dirty or damaged disc may cause the computer to 'hang' while it tries to read the disc. If necessary, reboot the computer,
remove the disc and then check that it is not dirty or damaged.
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Check your PG settings (Parental Guidance) in the DVD software as they might be preventing you from playing certain DVDs
when they are activated.
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On your computer, the default DVD region code is 2. Do not change this setting using the Region Code Change function in Windows, or using any other software applications.
System malfunctions originating from the user changing the DVD region code are beyond the scope of your warranty and will result in service charges for repair.
If you do not immediately see the Display icon after clicking Control Panel, click Switch to Classic View on the left.
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Using your VAIO computer