No Audio Output Device is installed Windows 8 - no audio device detected in Device Manager

OS: Previously using Windows 8.1, now rolled back to Windows 8.
HP Pavilion p7-1423w
Product Number: H3Z92AA#ABA
This just seemed to happen on its own follwing a standard Microsoft Windows update. Suddenly, there is a red X on the speaker displayed down in the taskbar area, with the message: No Audio Output Device is installed. This originally happened using Windows 8.1. I tried numerous suggestions and nothing seemed to relate to my problem. Checking the Device Manager is Windows is useless, because no audio device is even detected. Drivers cannot be updated when no device is recognized as existing. I checked in the computer setup prior to booting to Windows and I cannot find anywhere to turn audio on. I thought that possibly audio had been disabled, at the source. Either that or the onboard audio on the motherboard has completely failed.
Hoping that a reset to factory settings would help, I backed up all of my data and proceeded with the reset. Now back to Windows 8, the same issue exists with the original factory settings. No audio output device detected.
Can onboard audio be enabled somewhere in the setup? OR is my motherboard's onboard audio fried?

Only option that I see in the BIOS is under Security.  Audio Device: Hidden or Available. It was set to available and I left it at that. Still no audio.
Really? Nothing? This computer is one year old. Absolutely no reason for this to be happening. What a joke.

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