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High pitched noise coming from inside a flat panel monitor.
Cause Solution
Brightness and/or contrast settings are too high. Lower brightness and/or contrast settings.
Solving Audio Problems
If the computer has audio features and you encounter audio problems, see the common causes and
solutions listed in the following table.
Sound cuts in and out.
Cause Solution
Processor resources are being used by other open
applications.
Shut down all processor-intensive applications or cut down
the number of applications running.
No sound.
Cause Solution
Volume has been muted or lowered. Double-click the speaker icon on the taskbar, and clear the
Mute All check box or adjust the volume level.
External speakers are not turned on. Turn on the external speakers.
External speakers are plugged into the wrong audio jack. Check the sound card documentation for proper speaker
connection.
A device, such as headphones, is connected to the line-out
jack.
Turn on and use headphones or external speakers—only
connect to one device at a time.
Solving Keyboard and Mouse Problems
If you encounter keyboard or mouse problems, see the documentation that came with the equipment
and to the common causes and solutions listed in the following table.
Keyboard commands and typing are not recognized by the computer.
Cause Solution
Keyboard connector is not properly connected. Replace the keyboard.
Computer will not respond to a USB keyboard or mouse.
Cause Solution
The keyboard or mouse is not connected to the computer. Make sure that the keyboard and mouse cables are
connected to the computer.
Solving Audio Problems
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