Pavillion dm4 audio has stopped working

Hello,
The audio on my HP dm4-2015dx (Product #LW478UA) notebook has suddenly stopped working. It runs Windows 7 Home Premium and has an Intel processor. I use Chrome as a browser.
I have updated BIOS, chipset and audio drivers.
I have run the Windows audio troubleshooter and it finds no problems and that the latest versions/updates are present.
I have checked that the Mute button is not on and that volume control is at maximum, as well as checking volume control on Youtube, etc.
I have re-downloaded the audio driver and saved it to downloads, then uninstalled the active driver, shut the machine down, pulled the battery, held the power button, restarted, entered through the BIOS menu, loaded defaults, etc. then installed the driver from downloads and set it as default.
Nothing. 
Both the Sound icon on the taskbar and when I go into Control Panel, Hardware and Sound, Sound, Manage Audio Devices, Playback tab actually show the sound level going up and down when I play a Youtube video, for instance. But no audio comes out of the laptop's speakers.
Can anyone please provide some guidance to correct this issue? 
Thank you,
Doug

Hi Doug,
Please take a look at this document, and let me know if the troubleshooting steps help resolve your no sound from your notebook speakers.
Good luck!
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