What program are you trying to use to record sound? It might just be that you've reduced the sound levels on the microphone. Or sometimes you have to manually select where the source of the sound is from, such as the built in microphone or the microphone/line in jack, etc. Check it in the control panel under audio. Does it usually work without anything else? If it has just suddenly stopped working then it might actually be a hardware fault. It wouldn't usually just stop working without interference (like if you accidentally changed a setting or something).
Post edited at 3:23 am on Sep. 12, 2008 by marshmellowman
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and victorious in war shall be made glorious in peace.