Sony Vaio microphone suddenly stopped working!

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Tomby
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Sony Vaio microphone suddenly stopped working!

Hello,

I've got a Sony Vaio VGN-SR290 notebook which I recently updated from vista to windows 7 at which point the built in microphone stopped working. It just doesn't show up in 'sound' in the control panel undersss 'playback' where 'microphone' and 'speaker' are normally seen.

Please help what's gone wrong?!