Sometime this week, my MacBook Pro has lost its sound. I can't listen to anything that has the sound of iTunes for video clips. It is no longer a Volume icon (speaker w / lines of radiation) on my Menu bar

Sometime this week, my MacBook Pro has lost its sound. I can't listen to anything that has the sound of iTunes for video clips. It is no longer a Volume icon (speaker w / lines of radiation) on my Menu bar. My MacBook Pro is a mid-2012, 2.3 GHz Intel Core i7 Memory 16 GB 1600 MHz DDR3 OS X Version Yosemite 10.10.5

Graphics Intel HD 4000. Can anyone help?

Thank you very much!

Thai-Anh

Reset NVRAM may solve it.

How to reset the NVRAM on your Mac - Apple Support

Or system preferences > sound, check on 'Volume to see the menu bar' to show the volume of the sound in the menu bar.

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