it's the same fan sound u hear when u turn on ur computer, isn't it?
That happen when ur using the computer for a long time, so with the high temperature and when u do many things at the same time, it's just increase the fans speed. that's actually good 
i become happy when it does that, it means it's very accurate
It could happend also because your fan is almost dead and could not cool down your PC at low speed 
It happens once with my vaio. After 1 year fan started working hard all the time. Finaly computer started to shut down o restart because of different errors. I have sent it to repaire and they have changed fan. It returned to be silent. Now (after 9 month) I fear it starts to be noisy again.
It could happend also because your fan is almost dead and could not cool down your PC at low speed
well the laptop is only 2 weeks old,so i don't know if it's the same cause as yours but i'll contact sony to see
it's the same fan sound u hear when u turn on ur computer, isn't it?
That happen when ur using the computer for a long time, so with the high temperature and when u do many things at the same time, it's just increase the fans speed. that's actually good
it might be a good sign but is it normal as soon as you start using the laptop? you only have to open a page and you get the fan doing that noise where you said it has to be by using it for a long time i even wonder if it's not what makes the screen flash as it's overheating?
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