T400 Internal mic doesn't work

brandnew T400, 2 Duo P8700.
The internal mic doesn't work. I tried to use the sound recorder, and there is no voice.
I clicked control panel->sound-> recording, then the screen displays the interanl Microphone is working. but when I use the sound recorder, still nothing recorded.
Then I double clicked the internal microphone -> levels, the drag the bar of microphone and microphone boost all to the very right. Still the internal microphone doesnt work.
The speaker is working fine. It is a brandnew laptop.

Good suggestion on removing the driver then clean install the simple driver.
I have been having the same problem with recent new releases of the Conexant Audio Driver for HD on a T500.
Not sure when tech support will get around to fixing the problem. I have tried every combination of Add/Remove, Device Manager Remove, and even Rollback, but the problem persists... The internal microphone gets muted no matter what one does in configuration. You can get playback of audio from CDs and audio files, but the microphone gets disconnected from the system when you install the latest versions.
The following versions will disconnect the internal microphone in T500s:
v 3.64.10.0
v 3.64.10.51 (the latest release)
The only stable version appears to be v 3.64.7.0 for T500s.
IBM Lenovo does appear to post previous versions of all Conexant Audio Drivers.
I got lucky, since I keep copies of all previous installs available in order to revert back to a version that is stable.
The suggestion made by this board to install the simple Conexant driver (v 3.53.0.0) is appropriate.
Thanks for the link. I am keeping a copy handy just in case.

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T400 Internal mic doesn't work

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