Elitebook 2540p, windows 7 64bit profession​al, microphone not working

I have wonderful notebook elitebook 2540p,
I have installed windows 7 64 professional, using serial number on back of my notebook, I installed all drivers from hp support driver download section.
And I have problem with my microphone  even when I see in audio settings recording section green bars move when I speak the is no sound when i try to record it in standart audio redording software of windows.
In driver download section there is no driver for audio card.
Also there is no control in Volume Mixer for microphone.
Can you please provide me with link to install propper driver or ideas how to solve this issue?
my product key is: XT932UT#ABA
serial: (Personal information removed)
Best regards,
Denys.

Hello, have you fid any solution? I`m facing the same problem. Thanks... Paul. 

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