HP ProDesk 400 G2 Small Form Factor Maintenance And Service Manual page 95

Sound does not come out of the speaker or headphones.
Cause
Software volume control is turned down or muted.
Audio is hidden in Computer Setup.
The external speakers are not turned on.
The audio device may be connected to the wrong jack.
External speakers plugged into the wrong audio jack on a recently
installed sound card.
Headphones or devices connected to the line-out connector mute
the internal speaker.
Computer is in Sleep state.
Internal speaker is disabled in Computer Setup.
The application is set to use a different audio device than
speakers.
Some applications can select which audio output device is used.
The operating system controls may be set to use a different audio
device as the default output device than what is expected.
Sound from headphones is not clear or muffled.
Cause
Headphones are plugged into the rear audio output connector.
The rear audio output connector is for powered audio devices and
is not designed for headphone use.
Solution
Double-click the Speaker icon on the taskbar, then make sure
that Mute is not selected and use the volume slider to adjust the
volume.
NOTE: In Windows 8, the taskbar is available at the bottom of
the Desktop screen.
Enable the audio in Computer Setup: Security > Device Security >
System Audio.
Turn on the external speakers.
Ensure that the device is connected to the correct jack on the
computer. The rear audio jack output is the green receptacle. The
speakers should be plugged into the line-out jack and the
headphones should be plugged into the headphone jack.
See the sound card documentation for proper speaker
connection. The rear audio jack output is the green receptacle.
Turn on and use headphones or external speakers, if connected,
or disconnect headphones or external speakers.
Press the power button to resume from Sleep state.
CAUTION: When attempting to resume from Sleep state, do not
hold down the power button for more than four seconds.
Otherwise, the computer will shut down and you will lose any
unsaved data.
Enable the internal speaker in Computer Setup. Select Advanced
> Device Options > Internal Speaker.
Some graphics cards support audio over the DisplayPort
connection (if applicable), so multiple audio devices may be listed
in Device Manager. Make sure the correct device is being used.
To access Device Manager in Windows 7, click Start, select
Control Panel, and then select Device Manager.
To access Device Manager in Windows 8, from the Start screen,
type c, select Control Panel from the list of applications, and then
select Device Manager.
Make sure the application has selected the correct audio device.
Set the operating system to use the correct audio device.
Solution
Plug the headphones into the headphone connector on the front
of the computer.
Solving audio problems 87