Really annoying high pitched noise

[TomCollins]

My computer is making a really high pitched noise, however, it only happens once I log in. I can leave it in the login screen, and it won't make a noise. I can't isolate where the sound is coming from. Anyone have any guesses what it could be? I took out a video capture card, and that was not the source.

[cgwahl]

Might be a fan. Could also be the HD or speakers...

[OrcaDK]

Is this coming from the speakers or from any physical parts inside the computer?

[TomCollins]

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Is this coming from the speakers or from any physical parts inside the computer?

[/ QUOTE ]

It was really hard to hear where it was coming from when I got close. I pulled out every card I could, and started adding them one at a time. I have left out my modem and an old video capture card I don't have drivers for, and its gone away. I'll never know what it was.

My wife makes the same noise. Anything I can do to silence her?