loud fan

Hi all, I have been using the computer for the past couple of weeks and just recently, each time it boots up the gpu starts making a really loud noise ( I can hear it a few rooms down the hall). At first it sounded like the noise was coming from psu but upon further inspection it was the...

I've been getting really loud fan noise in Windows 8.1 on my MacBook Air 13" 2012, sometimes even in idle...no matter what I'm doing, from time to time it just starts to spin like crazy, and when i check Task Manager, CPU usage is usually singe digit number, just a few %... but still fan is...