Usually sound problems are related with the driver ..so ..first thing to do if you think you tried all rest ..is to reinstall the driver for sound card ..to be sure you have teh correct driver ..sownload it from teh support site of the manufacturer ..and select teh exact ,model ..and operation system, you have in the laptop ..Download the driver and run it to install ..all the way ..until asks to restart ..restart it ..and it should work if the card is not damaged..
here are all the drivers for your model ..It is selected for windows xp ..but all you have to do is to select other operation system and download ..
http://www.dell.com/support/drivers/us/en/19If you run windows xp and it originally come with Vista on it ..I think you may need to run the UAA architect driver first ..and after that the audio driver ..cause for the conexant audio driver ..It may be needed..It will basically not see the audio card in xp without it ..
http://drivers.softpedia.com/get/SOUND-CARD/OTHER-SOUNDCARDS/Microsoft-UAA-Bus-Driver-for-High-Definition-Audio.shtmlits a Microsoft bus driver for HD ..
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