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05-06-2012 06:22 PM
You have a couple of options as I see it.
Click start in search type Recovery Manager then click on it select Yes on User access control then select I need immediate help then select Driver & application recovery select the Sound & Audio driver and install it then restart the unit check if the sound works fine.
Go to device manager and uninstall the driver and restart and unit will install the driver automatically.
Try doing System restore to the date when the unit was working fine.
Try to update the driver from hp.com website for Audio & Bios.
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