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This would be a bull horn built into the covering of the CPU, with the small part of the bullhorn right over the place that makes the noise that I have to pay attention to tell whether my computer is still working on a task, for instance opening up the 10th instance of a browser, and the large part of
the bull horn pointing out of the CPU casing toward me.
||That is what the blinky red light is for.
The sound you are hearing is the hard drive, not the CPU (well unless your super power is hearing electrons banging together).