Solving Audio Problems; Solving Keyboard And Mouse Problems - HP 510B - Minitower PC Maintenance And Service Manual

High pitched noise coming from inside a flat panel monitor.
Cause
Brightness and/or contrast settings are too high.

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
Processor resources are being used by other open
applications.
No sound.
Cause
Volume has been muted or lowered.
External speakers are not turned on.
External speakers are plugged into the wrong audio jack.
A device, such as headphones, is connected to the line-out
jack.

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
Keyboard connector is not properly connected.
Computer will not respond to a USB keyboard or mouse.
Cause
The keyboard or mouse is not connected to the computer.
Solution
Lower brightness and/or contrast settings.
Solution
Shut down all processor-intensive applications or cut down
the number of applications running.
Solution
Double-click the speaker icon on the taskbar, and clear the
Mute All check box or adjust the volume level.
Turn on the external speakers.
Check the sound card documentation for proper speaker
connection.
Turn on and use headphones or external speakers—only
connect to one device at a time.
Solution
Replace the keyboard.
Solution
Make sure that the keyboard and mouse cables are
connected to the computer.
Solving Audio Problems
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