Was the audio working when you had the computers working on the previous operating system?  If not, have you gone to System Setup (F2 during the Dell logo after starting the computer) and made sure that the integrated audio is enabled?

In order for all the device drivers to install properly it is necessary to follow a particular installation order.  The Dell System Software found in the System Utilities category on the support page, and the Intel Chipset Driver in the Chipset category must be the first drivers installed and in the given order.  The remainder are not as order critical, but Dell recommends you follow the first two drivers with those for the Video, Network, and Sound adapters.  Once you reach the sound adapter you will find on-screen directions that should be followed.  There are two files, the one labeled "Hard Drive" being the most straightforward.

Yes the audio was working with Windows 7 SP1.

I make the procedure in this form:

- install the chipset driver

- install the network driver

- install the video driver

- try to install the audio driver

Ok i am going to install Dell System Software.

Greetings

were you able to run optiplex 390 on XP? i am planning on buying 390.

XP is supported on the Optiplex 390

Chipset Drivers Must be installed First.

Update Package for Microsoft® Windows®
Chipset_Driver_R73F7_WN32_7.0.0.1144_A01.EXE
Update Packages for Windows can be used as a stand-alone application to apply an update and ensure that specific validation criteria are met before performing the update.

Hard-Drive
INTEL_UNIFIED-7-MANAGEMENT-I_A01_R300750_ZPE.exe
This file contains a compressed (or zipped) set of files. Download the file to a folder on your hard drive, and then run (double-click) it to unzip the set of files. Follow the instructions to complete the installation.

Update Package for Microsoft® Windows®
DRVR_WIN_R292027.EXE

Hard-Drive
NEC_USB-3-0_A01_R292027.exe

Update Package for Microsoft® Windows®
DRVR_WIN_R293337.EXE

Hard-Drive
Intel_Chipset-Software-Insta_A02_R293337.exe

File Name: Update Package for Microsoft® Windows®
UTIL_WIN_R304257.EXE

Hard-Drive
Intel_Identity-Protection-Te_A03_R304257.exe

Update Package for Microsoft® Windows®
OP390_DRVR_WIN_R307709.EXE
Update Packages for Windows can be used as a stand-alone application to apply an update and ensure that specific validation criteria are met before performing the update. See the Dell Update Package User's Guide for more information.

Hard-Drive
CONEXANT_AUDIO--CX20641-CX20_A02_R307709.exe
This file contains a compressed (or zipped) set of files. Download the file to a folder on your hard drive, and then run (double-click) it to unzip the set of files. Follow the instructions to complete the installation.

Hello

Thank you for the response.

I installed XP and the audio drivers long time ago, the issue is caused by the order of the drivers that you install first. Yes the chipset package its first and the dell package of drivers second, then you can install the conexant audio driver package and the hardware is recognized.

Greetings

i try this  with xp sp2 but can't install also..

Hi,

I understand that you are trying to install the audio drivers on the computer. Please confirm if I got it correct.

Please provide if there is an error message when installing the drivers.

Also let me know if the computer model is an OptiPlex 390?

I am joining this thread because the post date is the most recent I have found on this issue.

I have more than eight of these Optiplex 390 machines installed and running XP SP3. Some have working souund, some don't.

I had sound working on all but one at one point. Loading the driver after BIOS/chipset drivers had no effect - I always loaded sound last.

The drivers were loaded from Resource disks and fresh downloads from dell support. Microsoft.com's Fixit program worked Once, but doesn't work any more.

Control Panel and error messages all say there is no sound device in the computer. Device Manager shows audio codecs and legacy devices.

The bios setting/miscellaneous devices show no motherboard device to enable/disable.

I have 2 machines presently with no sound, that had sound for a while - the machines were moved and different monitors, mice and keyboards were attached - no other changes were made.

I have an Optiplex 390 small form factor (only 1) that never had sound - I resorted to using an external USB sound device on this machine.

There is no Conexant HD sound driver readily available for the Optiplex 390 - to use with Windows XP.

A lot of businesses are using this model as recommended by DELL, for XP compatibility. DELL should address this issue.

I hope this information is useful.

Drivers for Desktops\Precision Workstation\Precision 390

View the full details here

Quick Links

• Application
• Audio
• BIOS
• Chipset
• CMSDK
• Communications
• Diagnostics
• Displays
• Input
• Legacy/Applications
• Legacy/Audio Drivers
• Legacy/Chipset
• Legacy/CMSDK Components
• Legacy/Communication Drivers
• Legacy/Diagnostic Utilities
• Legacy/Display Devices
• Legacy/Input Device Drivers
• Legacy/Network Drivers
• Legacy/Printer Drivers
• Legacy/Removable Media Storage Devices
• Legacy/SAS RAID devices
• Legacy/SCSI non-RAID Controllers
• Legacy/Security
• Legacy/Serial ATA
• Legacy/Serial-Attached SCSI Drives
• Legacy/System and Configuration Utilities
• Legacy/Systems Management
• Legacy/Tape Devices
• Legacy/Video Drivers
• Network
• Removable Storage
• SAS Drive
• SAS RAID
• Security
• Serial ATA
• System Utilities
• Systems Management
• Tape Drives
• Video

There is no conexant HD audio driver because the board revision you have may have something else.

SIGMATEL STAC 92XX C-Major HD Audio is the correct driver.

http://ftp.us.dell.com/audio/R127208.EXE

I too have an Optiplex 390, Win XP SP2.  While I tried installing the Connexant Audio, it was not recognized as others here have posted.  I installed the Sigmatel driver above, which did not work, but at least caused the "unknown PCI device" to become a "HD audio bus" with missing driver.  Once that occurred I was able to install the Connexant HD audio driver and I now have sound!  Thank you!  Hope this helps someone...

Chipset - Driver

Description	Importance	Version	Released	Supported OS	Download
Intel Chipset Software Installation Utility, v.8.1.1.1010, A01 Software support for Intel Chipsets.	Recommended	8.1.1.1010	11/30/2006	Windows Vista 64-bit Windows Vista 32-bit
Intel Chipset Software Installation Utility, v.8.0.0.1009, A15 Software support for Intel Chipsets.	Urgent	8.0.0.1009	7/28/2006	Windows 2000 Windows XP Windows XP x64

Chipset Drivers are REQUIRED BEFORE installing PCI Devices.

http://ftp.us.dell.com/Pages/Drivers/precision-390.html

Chipset Drivers are Required for PCI Devices to enumerate properly.