Sony VAIO VAIO PCG505F User Manual page 94

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Some titles require specific files that are located on the application's
CD-ROM disc. Insert the disc and try starting the program again.
Make sure you place the disc in the tray with the label side facing up.
The diskette is write-protected. Disable the write-protect feature or
use a diskette that is not write-protected.
Check that the diskette is properly inserted into the floppy disk drive.
The built-in speaker is turned off. Press Fn+F3 to turn on the speaker.
The speaker volume is turned to the minimum. Press Fn+F4, and then
press
or
If your computer is powered by the battery, check that the battery is
connected properly and that it is charged.
If you are using an application that has its own volume control, check
that the volume is turned up.
Check the volume controls in Windows 98.
If you connect external speakers, check that the speakers are properly
connected and the volume is turned up. If the speakers have a mute
button, make sure it is off. If the speakers are powered by batteries,
check that the batteries are inserted properly and that they are
charged.
If you have connected a headphone or an audio cable to the
Headphone connector, disconnect the cable.
Click the System icon in the Control Panel. Change the settings under
Device Manager so that sound is enabled.
Check that the phone line is plugged into the line jack. See
"Connecting a Phone Line" on page 34 for details.
Check that the phone line is working. You can check the line by
plugging in an ordinary phone and listening for a dial tone.
to increase the volume.