As well as just about everything else that changes on the screen, from loading a webpage, scrolling a window, typing, moving the mouse around, etc.? I have the headphones on, and I can hear it all. When I try to record a screencast with Camtasia 7, I get a lot of noise in the audio track.
I have an Asus desktop (within a year old). 64-bit running Windows 7.
Thanks for any suggestions! If I need to provide more information, please let me know.
Edit: The noise is like a high-frequency whirr with different high-frequency chirps when the different activities on the screen take place. They're not loud chirps, but I can hear the frequency of the whirr change a bit, if that make sense.
I have a wireless keyboard and mouse. Someone else suggested switching those out with a wired KB/mouse.