It most probably is the fan. I am guessing you are using a laptop which tends to heat fast and the fan is working with its full capacity. Hence the noise.
Try buying en external laptop cooling set which will reduce the performance of the internal fan and reduce the noise.
Cheers
It is most likely the fan. When doing things like watching flash video (e.g. YouTube or Hulu), it uses a lot of CPU power, thus your fan needs to spin in order to keep your computer from overheating.
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