A:Answer Hey Sonny!
I've had this PC for about 2 weeks now and that was the first thing I noticed when it powered up.
I actually contacted customer support about it and found out a somewhat sad truth.
The way this PC is built is the result of the noise. The fan thats so loud is a case fan. It is a 3 pin connected directly to the power supply, meaning it runs full speed always. Now if it was a 4 pin you could hook it to the motherboard, and then control the speed through the BIOS and things like that.
Basically you can maybe buy a fan controller, or buy a new 4 pin fan, and connect it to the motherboard.
Hope this helped!