Well I am first of all very frustrated because I purchased this computer off of craigslist and I have either had a hit or miss there. So i go to install it everything works just fine, I open a game and I hear this loud fan noise or what it seems to sound to me as or as coming from the hard drive. There is two things I have found out it only happens when I am playing a game or formatting the hard drive. I just bought a brand new video card and hard drive with in the past month and I am tired of wasting money. I really hope someone could help me out here I have pretty much come to the consensus that its the psu or the cpu otherwise i have absolutely no idea.