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HP Compaq dc7800 Desktop PC series - Internal Speakers not Working After Upgrading to Windows 7
Internal speakers do not work after upgrading to Windows 7 using HP Windows 7 upgrade disk. However, audio works fine with external speakers or headphones connected to front or rear ports.
To resolve this issue, install ADI High-Definition (HD) audio driver (sp45615.exe) . It can be downloaded from the link below:
Click here to download the audio driver at http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=US&swItem=vc-75954-1