Aha! Finally figured out the problem guys.
I emailed the guys who sent me the PC, and they said when they shipped it, it was very quiet, however it must have gotten messed up during delivery.
I"m thinking.. this thing is going off like a buzzer, so they must be telling the truth then cuz it certainly doesn't sound right.
Apparently the fan was hitting a wire which was causing all the noise!
I"m just glad a fire didn't start! Fan is quiet as a mouse now