Hi Yobrak,
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I see that after a recent update in Windows 8.1 you lost your audio. Just to clarify, it was a Windows 8.1 update, not that you upgraded to Windows 8.1 that caused this, correct?
You have tried updating the driver and doing a restore back to an eariler date but no change.
I suggest you try this first.
Uninstall the audio driver
Update the chipset driver and then reinstall the audio driver.
Here is a link to a document to assist with this issue.No Sound from Speakers (Windows 8). Have you run The HP Support Assistant to help resolve this issue and to look for any updates? Have you tested for hardware failure.? Testing for Hardware Failures (Windows 8).
If the hardware tested fine and it is still not resolved, I suggest you do a recovery back to factory. Performing an HP System Recovery (Windows 8). You will receive a prompt during this process to backup your personal files. If you have not yet done a backup, I suggest you do it now, to prevent data loss. Restoring Files that were Backed Up Using HP Recovery Manager (Windows 8).
Here is a link to aid in updating to Windows 8.1 again. Updating Windows 8 to 8.1
You can also call HP support for assistance.
Please call HP technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. HP Technical Support Sitemap