Let me know first are you using windows vista or xp! okey go to the dell site click download drivers and put yr service tag or model than download the latest version of sound driver and no driver is realeased for bios A16 if u have problem so make it Bios version A02 ..
It is likely that the BIOs update left the sound chip setting switched off. Simply go into the BIOs and find the section for Onbpard DEvices and re-enable it.
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