problem sound

hello
yes, I have a new problem,
since yesterday evening I can not hear sound on my computer: (
playing a shooting game online is very annoying: s ( cs )
I of course check that the mixer is not on mute and I see if I did not have a driver update. I'd like to know or could it come ...
thank you in advance for your answers.

Hello

thank you for having opened a new topic, it will be more clear.

Could you have the sounds of Windows?
see "config panel" sounds and audio device

I find the icon sound but not sound and peripherals and I do not have a sound card, I use the ports of my motherboard.
I heard no sound (msn music ... etc)
I check my hifi my headphones was good so the problem does not come from there
against but I was surprised this morning I looked in the configuration I click on the test I heard the sound of the test when I try to put music, but again, nothing.
bizar ...

I'm just stupid, I work with and I realteck set to digital output when the need for speakers by default ...