Windows 8 . Headphones detected but no sound

I have a big problem with sound on my computer. I have Realtek High definition Audio sound and it is not working ok. Here is the situation: On device manager I can see (under Audio inputs and outputs)

Realtek Digital Input,

Realtek Digital output (2x),

Microphone (Realtek High definition Audio) and

Realtek HD Audio 2nd output (heaphones icon).

In Realtek HD Audio Manager I have HD Audio 2nd output as default output for front green jack. Everything looks fine - no conflict or anything like that.

When I start my computer in headphones I can hear that silent constant sound, like you hear when you turn on speakers. So everyhing looks ok.

When I play some thing (youtube for example) I can see (on right bottom corner) that Realtek HD Audio 2nd output (headphones) is actually playing the sound. So everything ok again.

But no sound is coming from headphones. It is driving me crazy - I tried every combination of checkboxes and radio buttons in Realtek HD Audio Manager.

I really don't know what to do any more. Any help would be appreciated.

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