I can hear any sound when i play movies, music and for any alerts. what can be the cause?

I've finished watching a movie on my computer last friday and shut down it. All has been so well. Yesterday nigh, I started it but I didn't hear the starting alert submitted by window 7. I tried hear a music but I was also unable to hear any sound both in media player, itunes and VLC that I use like media reader.
I maked a test, all speackers are running and are not muted.
How can I solve this problem please. Any help
Thank you in advance.

Troubleshooting issues with no audio from built-in speakers on Macs
I hope this helps.

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