p.s. motherboard has problems with built-in sound (that said old motherboard owner, where I can accept, because sound from motherboard isn't working) which might be reason for non-sound from beeper but I have solution I got 'genius' sound card - http://www.cstuff.co.nz/images/Store960/%7B703A92C6-09B5-4C9C-B66A-A2BB9BDBC236%7D.jpeg
which is connected with mb and was working fine before I had an issue with mb, I am no that good at computers but perhaps I can connect beep with sound card? is there any possibly lead ? Thank you for your time.