Chirping noise every 2 seconds, mute stops it!

Today I noticed that my MacBook Pro has suddenly started sounding like there's a small bird trapped inside it.
At first I thought I could hear birds outside but it's too rythmical, with a chirping sound made about every 2 seconds. It's coming from the MacBook and appears to be equally loud through each speaker.
I don't think that it's due to the fan or the drive as it's coming from the speakers AND it stops when I mute the volume.
Any ideas what this could be? I really can't afford to have my machine die on me right now and am rather worried!
Thanks for any help.
Robert

Welcome to Apple Discussions!
No idea what this is, but it might not hurt to run some diagnostic tests. You could run the extended version of the Apple Hardware test and see if anything shows up in the form of an error code.
You could also run this utility:
http://www.versiontracker.com/dyn/moreinfo/macosx/32454
You can download the demo and run it several times for free. It will give you a comprehensive view of the physical health of your hard drive.
I wonder if the speaker is picking up a sound from the drive or the fan and magnifying it. If you mute the volume, can you still hear the sound faintly?
Good luck!

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Chirping noise every 2 seconds, mute stops it!

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