HP Compaq dc7800 User Manual

Table D-7 Solving Audio Problems
Sound cuts in and out.
Cause Solution
Processor resources are being used by other open
applications.
Shut down all open processor-intensive applications.
Direct sound latency, common in many media player
applications.
In Windows XP only:
1. From the Control Panel, select Sounds and Audio
Devices.
2. On the Audio tab, select a device from the Sound
Playback list.
3. Click the Advanced button and select the Performance
tab.
4. Set the Hardware acceleration slider to None and the
Sample rate conversion quality slider to Good and
retest the audio.
5. Set the Hardware acceleration slider to Full and the
Sample rate conversion quality slider to Best and
retest the audio.
Sound does not come out of the speaker or headphones.
Cause Solution
Software volume control is turned down or muted. 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.
Audio is hidden in Computer Setup. Enable the audio in Computer Setup: Security >
Device Security > Audio.
The external speakers are not turned on. Turn on the external speakers.
The audio device may be connected to the wrong jack. Ensure that the device is connected to the correct jack on the
computer. The speakers should be plugged into the rear line-
out jack and the headphones should be plugged into the front
headphone jack.
External speakers plugged into the wrong audio jack on a
recently installed sound card.
See the sound card documentation for proper speaker
connection.
Digital CD audio is not enabled. Enable digital CD audio. In the Device Manager, right-click on
the CD/DVD device and select Properties. Make sure Enable
digital CD audio for this CD-ROM device is checked.
Headphones or devices connected to the line-out connector
mute the internal speaker.
Turn on and use headphones or external speakers, if
connected, or disconnect headphones or external speakers.
Computer is in standby mode. Press the power button to resume from standby mode.
CAUTION: When attempting to resume from standby mode,
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.
Internal speaker is disabled in Computer Setup. Enable the internal speaker in Computer Setup. Select
Advanced > Device Options > Internal Speaker.
234 Appendix D Troubleshooting Without Diagnostics

HP Compaq dc7800 Specifications

General

Tcase	73.3 °C
Bus type	FSB
Stepping	M0
Processor cache	2 MB
Processor cores	2
Processor model	E4600
System bus rate	- GT/s
Processor family	Intel® Core™2 Duo
Processor series	Intel Core 2 Duo E4000 Series
Processor socket	LGA 775 (Socket T)
Processor codename	Conroe
Processing Die size	111 mm²
Processor frequency	2.4 GHz
Processor cache type	L2
Processor lithography	65 nm
Processor manufacturer	Intel
Processor front side bus	800 MHz
Processor operating modes	64-bit
ECC supported by processor	No
Thermal Design Power (TDP)	65 W
CPU multiplier (bus/core ratio)	12
Number of Processing Die Transistors	167 M
Internal memory	1 GB
Internal memory type	DDR2-SDRAM
Maximum internal memory	8 GB
Memory layout (slots x size)	2 x 0.5 GB
HDD speed	7200 RPM
HDD interface	SATA
Optical drive type	DVD Super Multi
Total storage capacity	160 GB
Audio input	1
LightScribe	Yes
Networking features	Intel 82566DM Gigabit Network Connection
Graphics card RAMDAC	400 MHz
Storage drive controller	SATA 3, 0 Gb/s NCQ SMART VI
Discrete graphics card model	Intel® GMA 3100
Maximum graphics card memory	0.256 GB
Operating system installed	Windows Vista Business
USB 2.0 ports quantity	8
Chassis type	Mini Tower
Country of origin	China
Cable lock slot type	Kensington
Operating altitude	0 - 3048 m
Non-operating altitude	0 - 9144 m
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	10 - 35 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	10 - 90 %
Power supply	365 W
Product type	PC
Processor code	SLA94
Processor ARK ID	32242
Processor package size	37.5 x 37.5 mm

Weight and Dimensions

Depth	452 mm
Width	177 mm
Height	447 mm
Weight	11800 g