You didn't give a lot of information about what you checked, can you give me more info?
Do you know what type of Sound card it is? Do you have the software drivers to run it?
In Settings / Control Panel / Multimedia
Under the Devices Tab
The is an Audio option, if you click on that does it display a message saying "No Audio drivers are installed" or does it look like something is installed already.
If there is nothing installed, you will have to re-add the drivers to get the sound card to work.
If you can answer some of this questions I may be able to help you out more.
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