No audio suddenly on my HP All-In-One

[bluemoon20]

Thanks for your note. I tried a lot of things on my Envy and finally...this solved the same issue on my Envy.

[kkwb01]

Going to try this tonight!   Like others, first happened a month ago, just out of warranty.  I managed to reinstall the Realtek HD driver and somehow it worked.  But this time I am totally stuck.  We shouldn't have to be pre-IT technicians to keep these rather expensive computers on the road.  Come on HP - do your bit for queen and country (or president).  

[Ken_K5RG]

For my Envy All-in-One 27-b245se the fix was detailed in the accepted solution posted in the thread titled:  Since HP BIOS update no audio output device is detected.  The key giveaways for me were the complete loss of the Realtek High Definition Audio driver listing in the Device Manager along with the HP Audio Diagnostics determination of No Speakers found.  Under Device Manager/System Devices, the Intel or Microsoft Smart Sound Technology driver is shown with a yellow splotch.  Updating this driver results in it disappearing but being replaced by the Realtek High Definition Audio driver under the Device Manager/Sound, video and game controller listing along with some Intel sound driver. A System Restore fails so it wasn't a solution for me. Why an HP initiated update screws the Envy speaker system hardware/software interface is beyond my pay grade but at least I don't have to reimage my hard drive (SSD) which was what I had to do 8 months ago when this problem occurred the first time. Obviously HP isn't going to fix its update problem but when it happens at the next critical HP update (BIOS update in this case), I will hopefully remember what has to be done.

[kkwb01]

ok, here is another fix.

Just reiterate that the problem was no sound from Bang & Olufsen speakers on HP Envy ALL IN ONE 27 B205NA

Tried the fix on this thread but it didn't work for me,

But this did:

• Open Device Manager (Open the start menu, type Device Manager and press enter) and select System Devices (close to the end of the list).
• Locate Intel Smart Sound Technology driver (SST).
• Right-click and select Update Driver from the pop-up menu.
• Choose browse my computer for driver software and then Let me pick from a list of available drivers on my computer and select High Definition Audio.
• Click Next.
• Intel Smart Sound Technology (SST) driver will disappear and you should have Audio back.

And there it is.  Source https://mspoweruser.com/how-to-fix-the-no-audio-output-device-is-installed-error-after-the-windows-1...

[ebospain]

Worked for me. Thank you.

[Ken_K5RG]

If the loss of audio was solved by a System Restore, I suspect the problem will reoccur once the HP Update executes again since the System Restore undid the HP Update that did you in.  The solution is posted in a number of places in this support forum.  The thread: Since HP BIOS update no audio output device detected  has the solution which is a little more complex than it really needs to be.  I have found after the HP update that the Realtek High Def audio driver disappeared in the Device Manager/Sound, video and game controller heading which essentially was replaced by the Smart Sound Technology (SST) driver under the Device Manager/System Devices marked to be in error (yellow splotch).  Just selecting Update this SST driver (right click on driver listing) restored the Realtek High Def audio driver plus others with the SST driver disappearing after it had been updated.  The forum's search function is your friend, the problem is that the same issue has been described with different terminology which results in multiple threads.  My specific experience with the Envy All-in-One is in another thread but since one can't post URLs to point to the specific thread, I rely on keeping hard copies of the posted solutions.  FYI, I have been having this problem with the HP updates for over 8 months now (only twice) since I limit the hardware updates to critical updates which in the latest case was a BIOS update.  I think the HP Support Assistance is the culprit in executing these updates.  I don't believe that the Windows 10 updates are the problem since over the last 8 months, I 've had no problems with the Window 10 updates, only the HP Support Assistant updates.  Years ago, the Windows updates would suggest hardware driver updates which I disabled many years ago.  Not sure if that is still the case with Windows Updates but allowing Mr. Gates and not HP to update your hardware is inviting major problems.  Typically a System Restore would undo those type of driver updates but I have never had a System Restore work even though I manually create a System Restore point on a regular basis.  My go-to solution has always been my hard disk (SSD) Windows Image backup coupled with a File and Folder backup to restore the User files that I've changed/created since the SSD image was saved.

[TechGurus]

Kkwb01 is right, the fix is incomplete now or had changed due to updates by HP.

HP released another update this week which now broke Intel SST. I got called out to the same client. It also was causing his system to crash whenever he used the HP volume buttons to turn his volume down to zero (0).

But since I had done the full fix listed in the solution I'd posted back in December, all I had to do this time was:

1. Open Device Manager to ACPI section

2. Locate and remove "Intel Smart Sound Technology driver (SST)" which may vary slightly on your list

3. This will probably result in 2 unknown Intel hd audio devices. "Scan for hardware changes" and it will reinstall the audio components.

This should fix your HP volume control as well to not crash.

I do agree with Ken_K5RG, this problem probably had a few threads, and I think they likely fixed the problem with one update since December but created a new problem which is why the Intel SST issue just appeared. So new readers should try that fix first if it looks relevant, before the Accepted solution.

[SteveC4]

I have two Envy AIO 27-bxx desktops, third time audio has crapped out after a Windows update. Many of the garbage answers/suggestions from HP are a waste of time. System restore worked (in terms of the actual restore, but not fixing the sound issue) on one computer and failed (to the point of getting a stop code/0xc000021a BSOD) on the other, which required using external drive/bootable media. Don't go that route unless you've had some experience with failed restores. 

Used the HP assistant to download/install a driver from https://support.hp.com/us-en/drivers/selfservice/hp-envy-27-b200-all-in-one-desktop-pc-series/193905.... Chose v1909. After installing and rebooting, still no Realtek device showing under Sound... in Device Manager (and you may have to change the view to show hidden devices).

Go to Control panel - add/remove programs - uninstall the Realtek High Definition Audio Driver (also used the HP Recovery assistant to install the factory version, to no avail), especially if you've tried installing a new driver from the HP page. After uninstalling and rebooting, sound worked again. It was that easy - after failing 200/1000/3000/etc times to invent the light bulb.