I have two PCs with Mother Board DG31PR. I was facing problem while installing Audio Driver on these systems. Both were showing installed drivers from Device Manager. While checking the same from Control Panel “Sounds and Audio Devices”, one was showing “No Sound Device” message at top and other was showing “Realtek HD Audio Output”. On both systems i was unable to run audio.

I searched but couldn’t find solution. Found many quires but without complete answer or the answers i found was unable to solve the issue.
Following are some of the queries i found related to this issue,

Intel DG31PR Motherboard sound driver installtion issue
Problem in installing audio driver of DG31PR with window XP sp-2
DG31PR Audio driver installed but sounds not working
Install Realtek Audio Driver Failure DG31PR
Audio driver for DG31PR installed but not started.
Sound driver for DG31PR installed but not working.

Info:

To confirm the Mother Board Model,

Goto Start > Run and type dxdiag
It will run DirectX Diagnostic Tool, under “System Information” find “System Model” it should be DG31PR.
Intel DG31PR Motherboard has a built-in Sound of Realtek.

Solution:

Uninstall audio driver if any installed already:
Goto Control Panel
Click on Add or Remove Programs
Find “Realtek Audio Driver” and Click Remove to uninstall

Download the correct Driver:
Goto Download Center of intel and download the following driver,
http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=19354&lang=eng

Note: Its the older version, do not download the latest version.

Install it and enjoy the audio on your Intel DG31PR.

Alternate Download location,

Intel DG31PR Realtek Audio Driver