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Why isn't my mic working?

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Ok, I have a Toshiba laptop with windows vista. I go to the control panel and check sound devices, and it said I have a Realtek High Definition mic in my computer and that its working. But whenever I run sound recorder or speech configuration or anything, no sound seems to go in the computer and I can never play any back. I know it is set as my default mic because its the only one in my computer and the "set as default" button is faded out and unclick-able. Somebody PLEASE help, this is so frustrating!