Terrible Sound

When I record a movie using my iSight camera and using the built in microphone, I get the nastiest background sounds. More like a high pitched hum.
I am recording in a quiet room and there is nothing else causing noise.
In the old days I would assume it was a issue with the power giving EMF, it sounds like that but it isn't.
Anyone suggest what I can do to trouble shoot as I have looked all over the forums and to no avail.

Hi,
1. Post your part number (p/n) . You'll find it at the bottom of the laptop on a sticker, which looks like this.
2. Which system are you using now?
3. Go to:
Control Panel -> Devices Manager -> Audio, Video and Games Controllers
and find there IDT audio card. Click on it with right button of your mouse and choose properties. Then go to ' Details ' tab and paste here Hardware Ids . This way we will know what it is.
Below You've got example how to do it:
4. Download and run DPC Latency Checker. Show me screenshot with graph from it.
** Say thanks by clicking the "Thumb up" icon which is on the left. **
** Make it easier for other people to find solutions, by marking my answer with "Accept as Solution" if it solves your issue. **

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