When I turned on my computer this morning it had a new noise coming from the top of the screen at the back.  Not loud but almost whirring.  What might this be ?

When I turned on my computer this morning it had a new noise coming from the top of the screen at the back. 
Not loud but almost whirring. 
What might this be ?

21.5 Mid 2010
Processor  3.2 GHz Intel Core i3
Memory  4 GB 1333 MHz DDR3
Software  OS X 10.8.5 (12F37)
I just found an answer ! 
I had moved my computer into another room and had to turn up the brightness, as I have always had it on the lowest setting.  In doing so it created the noise, I turned it right down and it stopped.  I have now set it about level 3 so it's not so distracting.
thanks

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