I even upgraded Dell BIOS/UEFI firmware to latest version (A07), but it didn't fix anything. Windows troubleshooting is useless as usual, not giving any help, only asking me to plug in an earphone, like I didn't know it. I've tried installing the Realtek HD Audio driver from Dell supporte page for my product (entering the service tag to be 100% sure), but no luck. I reinstalled Windows 8.1 in his system hoping to have audio working again, but the problem persists. When I plug an earphone, the speaker/earphone tab is visible as it should be, disappearing after I unplug it. When I open the Realtek Audio Manager in Control Panel, only the microphone tab appears. Then, I performed did a clean install and installed the Realtek audio driver again, but audio is still disabled. I first upgraded to Windows 10 and installed the Realtek audio drivers.
I installed the latest version of Realtek HD Audio driver (R2.79), and restarted, but the audio continues disabled unless an earphone is connected. However, if I plug in an earphone, the audio output is enabled and the Windows speaker icon changes to normal one. In Windows 8.1, the audio was working normally, so it's not a hardware issue.
Since I upgrade to Windows 10 (coming from 8.1) in my friend's Dell Optiplex 3011 All-In-One computer, with built-in speakers, the audio has been disabled, and I see the Windows speaker icon is with an "x".
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