Headphones not detected/playing sounds

Hello, I have been trying for quite some time now to plug in a headphone,
sound devices work properly and are up-to-date, all should be fine but it isn't.
I can't find my headphone on my laptop, neither can I use it.
Windows help and support is ridiculous, they get me nowhere, as usual.
It is slowly driving me crazy because all I want to do is a simple thing as
playing music on my headphones...

Anyway, details are:
Laptop: Acer TravelMate 7730, Intel(R) Core(TM)2 Duo CPU T6570 @ 2.10GHz
System: Windows 7 Ultimate
Short description: Sound plays from speakers, headphone not detected/working

please, anyone, help...

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