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I'm sorry about the issue, Here are a few things you can try to get it running a bit cooler and quieter :
1-End intensive processes : Your fan will start making noise whene you're running CPU-intensive processes, like games or video conversions, ect.. If you aren't doing one of these things, you'll definitely want to see if another process is eating up your CPU for no reason.
Press Ctrl+Shift+Esc to bring up the Task Manager, Check the processes tab to see if anything's taking up an abnormally large precent of your CPU's power—usually, if something's out of control, it'll be up close to 100. (Note that the System Idle Process is allowed to be that high)
2-Buy A Laptop Cooler : Due to their nature, size and increasing amounts of power; laptops seem to just get hotter and hotter.
A laptop cooler can be a good idea, it can alleviate this issue by artificially increasing airflow to your laptop's critical components.
3-Clean Your Fans : you can open up your laptop and dig around. You'll definitely want to clear all the dust out of your laptop, since this can cause overheating which could make your fans blow loudly. And, if your fans are really dusty, they could get especially noisy too.
4-Use SpeedFan software : you might want to install software that controls the speed of your fan. By limiting the speed you can vastly reduce the noise produced, though your laptop : http://www.almico.com/sfdownload.php
(click on SpeedFan 4.51).
If the problem persits, I would definitely suggest to contact Lenovo to make a warranty repair/replacement :
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