Intermittently, there will be a sound coming from inside the computer that sounds like a slight creak, not high pitched but sort of like when you step on a wooden floorboard. This usually happens as the system is coming out of load or going into load. I wouldn't be that worried about it normally, but since it hasn't happened before I'm wondering what could be causing it. Could the motherboard or video cards be "warping" from the heat? Could it be the PSU resettling? Is this normal? Edit: A more akin comparison might be to a car that has just turned off, and the engine makes kind of sporadic ticking noises as it cools off. Just wondering if computers could make this noise as well (but not as loud).