This may be the wrong section for this question, but here goes... Each time I hit enter, scroll or click my mouse (any input), my machine gets louder. It sounds like the power supply fan. I have seen power supplies go before, but have never seen one increase in volume with input. What is this noise???
Maybe it's trying to moan?
-- Ah sh*t! sys64738 --
Maybe your computer is set to use Smart fan control. When the CPU reaches a certain temperature, the CPU fan will spin up faster to cool it.