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The fan of my computer has started to make a lot of noise as of yesterday. It's alright the first 5 minutes after start-up but then it goes crazy as long as the fan is running fast. The core temperature is around 47 C on both cores so it's not even that hot and I recently open it up to check if it was dust covering the fan but it was fine (I blew away as much dust as I could but there was really nothing on it).
Here's a video of how the noise sounds (sorry for the vertical video...):
In the end of the video you can hear the sound at the fan intake
Acer Aspire v3-571G
Intel Core i5-3230M 2.6GHZ
Bios v. 2.21
Bought August 2013
What should I do? Replace the fan? Is it dangerous to run the computer when the fan is making this noise?
My computer has become pretty slow latetly and therefore the fan is running fast more often, maybe it helps to make a factory reset?