NO SOUND from notebook's jack to headphones!

Hello,

I'm having this curious problem. For example, I'm listening to some music (or watching movie it doesn't matter) and I plug in my headphones there's no sound from them (also when I do it ater restarting the playback ).
My notebook ( Lenovo V560 - Realtek audio manager of new version ) will pop-up a notification that I've plugged in some output to the jack but there is no sound.

The sound from the speaker mutes up immediately when I plug them in.

When I check the playback devices ( control panel->sound ) there are just speakers shown (and they are enabled) . I've reinstalled the audio driver and it still doesn't work.

Any help please?

Are you certain that the headphones are working?
Also, check "Show disabled devices"( by right clicking on empty/white field on the same box where the picture was taken), maybe those speakers aren't your headphone, that are enabled in the picture.

Yes, headphones work perfctly and the other thing is checked as well.
The system knows that something is plugged in the jack conector, but it won't recognize it and won't play any sound.