Check whether sound driver is installed .To check it in case of xp. by seeing in the device manager whether any yellow question mark is appeared in sounds. In case of vista also you can check it in device manager unknown device will appear if driver is ot installed . if the driver is not installed kindly download it and install it from following link http://h20000.www2.hp.com/bizsupport/TechSupport/ProductList.jsp?lang=en&cc=us&taskId=135&prodTypeId=321957&prodSeriesId=3466274
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Check whether sound driver is installed .To check it in case of xp. by seeing in the device manager whether any yellow question mark is appeared in sounds. In case of vista also you can check it in device manager unknown device will appear if driver is ot installed .
if the driver is not installed kindly download it and install it from following link
http://h20000.www2.hp.com/bizsupport/TechSupport/ProductList.jsp?lang=en&cc=us&taskId=135&prodTypeId=321957&prodSeriesId=3466274