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Cleaning the fan won't stop the noise, it may help a little - the little bearing has worn having rotated millions of times.
Try a can of"air duster" spray to blow the muck away from the fan area.
You may need a new fan - the part is pennies but the labour will be more!!
The 'great fan noise' you heard was the fan's bearings. The looser the fan bearings became, the more the fan tilted, allowing the center hub of the fan to rub against the bearing base.
A laptop has a poor cooling system. All of the hardware components, are crammed into one tiny box. Air is the only cooling medium to keep these components cool.
The Processor, and the graphics chip are the two components that give off the most heat. When a Processor becomes too hot, it turns off. (BIOS turns it off) This is a Fail Safe feature built-in, to keep the processor from burning up.
I would advise not using the laptop until this has been corrected. Is the laptop still under warranty?