Powerbook chirping, buzzing...

[Sutekidane]

The powerbook in my sig seems to make odd noises from the speakergrill area, near the power button. It seems to only do this when my processor performance is on High. It's a really faint noise, but it seems to happen when it's processing information. Any ideas?

 

[CanadaRAM]

Crickets.
You should let them out

You're not alone:
http://forums.macnn.com/archive/index.php/t-208733.html
http://www.macosx.com/forums/archive/index.php/t-63706.html

And one other post that I found which was tracked down to the hard drive.