Unable to hear any sound on my laptop Equium U400-124

I have laptop Equium U400-124

recently it stopped my work system all together. If the volume knob is set up, I am unable to hear any sound.
I tried to update the software of audio drivers by going to Device Manager. then she came back as all up to date. I tried to go back to the date where he worked, but it also did not help.

Thank you very much

You can hear sound if you use external speakers or headphones/headset?

What operating system do you use?

Tags: Toshiba

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