I have no sound after HP update. please help

I have no sound, it states " no audio output device is installed"

Renia,
Apparently the issue is not on the list of issues that test program can detect.  Sometimes it works -- this time it could not see the problem.
Try this:
Perform the Hard Reset .  Boot the computer and log in
The procedure will not wipe out your data -- this is just a driver refresh to force the computer to read the drivers and software from the Operating System that is installed on your computer.
That may do it.
===========================================================================================
You said the problem arose after an Update.  You can try "going back in time" to when the sound worked:
Restoring Windows to a Previous Point (Windows 7
Using Microsoft System Restore (Windows 8)
System Restore sometimes works better if you first drop the system into Safe Mode:
HP PCs - Windows 8 Safe Mode
===========================================================================================
You may have to resort to uninstalling and then reinstalling the audio driver.
Control Panel > set icon view >  Open your Audio > right click on your audio driver > select Uninstall
Restart the computer and log in.  As you do so, the driver will reinstall itself.
More tips are outlined and explained in the guides provided earlier.
Kind Regards,
Dragon-Fur

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