T500, XP, audio problem, microphone, machine type: 2081, model type: CTO

Hello,
Microphone quit working.  Seems to be a software/driver issue. 
The ThinkPad is fully updated (e.g: both Microsoft and ThnikVantage) .
Microphone test (e.g: trying to record) results in no voice.
Video is operting well.  Also can hear well any calling party bu they cannot hear me.
Please help/advise.
Thanks, G

Fix my problem.
I found that the "Select" box not checked
In the Control panel->Sounds and Audio Devices,
Selected Audio tab in the Sounds and Audio Devices Properties
Selected Volume for the Sound recording Device ("Conexant HD Audio input")
The window that pops up has the "Seect" box.  Cheked it and the buiultin microphone now works.
I logged off this use and onto a different one.  Select flag was still on and mic worked.
Shudown then reboot next day and the flag was off again.
So my problem is some mysterious thing is turning off "Select".

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