Hi ,
After checking the HP Driver and Download page, as you said your product does not support Windows 8 or Windows 8.1. Since you have already tried the drivers directly from the manufacturer of the audio card. The only options that you do have are to restore your computer back to Windows 7 when it was working, leaving the computer the way that is, or purchasing the usb audio driver.
Regards.
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Re: No Audio or Sounds from Speakers or Headphone Jack after upgrade to Windows 8
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