Internal and external microphone doesnot working on HP probook 6550b

HP probook 6550b. Windows 7 Pro SP1 64bit.
Sound works without any problems but my microphone suddenly stops working today.
Usually i use my internal microphone.
I tried to plug in one of my external microphones to mic jack and it also doesnot working. I check my 2 external microphones on other PC and they both are woking properly.
1) Nothing new was installed today.
2) To fix this i tried to swich in sound properties default device but i dont see any green volume level behind mic images for both.
3) I removed all audio drivers
4) After PC was restarted windows installed default drivers but i still cannot record any sound. (Checked in skype and by green record level indicator in sound properties)
5) Also for default windows drivers i tried to switch my default microphone in 'sound' window settings and also plug in and out my external mics and without results.
Screen shot of windows after default windows drivers was installed:
What it can be?
Thanks.

First question, i would answer yes :
About this mac >Materiel > Audio (intégré) > audio haute définition Intel > microphone interne > connexion interne
Second question :
in system preference > microphone interne is black and not grey.
bars "sound test" near menu "entry level" does not move at all even if I shout...
Third question :
The power supply has been totaly replaced by a new one.
4rth :
Yes, no problem with speakers integrated or with the one of the headset...
On skype : i Hear but can not speak.
(i tested the headset on a PC, it works)

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