Amber light on case? What is it?

OK so ive been wondering lately..
What causes the little amber/orange light on the front of computer cases to flash when seemingly in use?
Is it the ram or the cpu?
What causes it?
Every computer has it..
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More about amber light case
  1. thats your hard drive activity light that is :) it flashes when the drive is being used, nothing to worry over
    Moto
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