Optiplex 390 Audio problem

iplayer is not a dell product and not supported here.

This computer is one of many OptiPlex 390s in a school. Iplayer works fine on all the other computers except one. I am not asking for advice on iplayer but am trying to repair the Dell OptiPlex that is faulty. I notice that it has a Conexant sound driver whereas the others show up in device manager as Microsoft. Conexant say to contact Dell with any problems.

A device that does not have proper drivers installed is not faulty.

Iplayer is a BBC app.

Often that is a symptom of leaving ActiveX Filtering checked (in IE8, IE9 , IE10, or IE11).  With 8 9 and 10 being end of life end of support.

Firefox ESR requires separate codecs and flash and java etc.

http://www.bbc.co.uk/webwise/guides/plugin/flash

Certain services offered on the BBC website such as audio, video, animations and games require specific additional third party software (called 'plug-ins'). You may have such software already loaded onto your computer. If you do not then, should you wish to use these BBC services, you will need to licence and download such software from a third party software company.

There is support for issues like this but it is not free.

Description	Supported OS	Download
Conexant CX20641/CX20651 High Definition Audio Driver This package provides the Conexant Conexant CX20641/CX20651 High Definition Audio Driver and is supported on OptiPlex 390/3010 that are running the following Windows Operating System: XP, Vista, Windows 7 and Windows 8.More details	Windows Vista 32-bit Windows Vista 64-bit Windows XP x64 Windows 8 64-bit Windows 8 32-bit Windows 7 32-bit Windows XP Windows 7 64-bit

I have already updated the driver and flash player and use google chrome but thanks for your suggestions

There is no flash player for chrome and Java does not work with chrome.  The flash in Chrome is called pepper.  Not to be outdone microsoft integrates flash with their browser in windows 8 and 10.
They also DO NOT SUPPORT JAVA in that browser as well.

The Flash player is called the AX version for previous versions of windows and the WIN version for firefox.

Firefox and other browsers routinely deactivate flash and Java because there are 50 to 90 updates per version.  Java 4,5,6,7 are all end of life.  Java 8 Update 45 I believe is the current version.

There are also 32 bit and 64 bit versions of Java and Firefox etc.

Apologies for the delay in answering I only work at this school on Fridays. This morning I have tried installing Java 8 update 45 and Flash Player and tested on IE as well as Chrome with BBC IPlayer and YouTube but it's still the same. It sounds to me like it's surround sound with a speaker missing. The background music is fine but the speech is missing. As it's a school all the computers play sound through headphones.

IPOD headphones will not work properly on any PC.  You are getting sound so its not a hardware issue.  BBC Iplayer is not supported here.

I have swapped headphones with another computer so I know it's not that