I updated my computer but there is no sound coming out

I updated my windows 7: HP Pavilion DV2-1209AX laptop's BIOS and now i have no sound. Is the upgrade defective?
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Hi,
Please follow instructions bellow to perform a hard reset
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01684768&prodT...
Hope this helps.
BH
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