No Sound Devises Detected on my Laptop after an Upgrade from Vista to Windows 7 !

I   own a hp dv9720us laptop.   I  upgraded from vista to windows 7, and have lost all sound. I've tried about everything , but nothing worked. hp 's site say they no  longer support  driver updates , since 2010. Can anyone help me , Please ?
                                                                                                                                   JIM

Hi,
Have you checked this ?
  http://h30434.www3.hp.com/t5/Notebook-Operating-Systems-and/General-Windows-7-Upgrade-Guide-for-HP-L...
Regards.
BH
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