So I have a Biostar 7600GS running in my parents rig that they use for general browsing. The card/the fan had been quiet as can be until a couple days ago. Now it's noisy as ****. It's not overheating - I check when it gets real noisy. The computer isn't overheating either - I check that too. The fan won't make a sound for say five minutes, and then it will start making a lot of noise. It will go in and out like that while the PC is on. Hardly ever stays quiet more than five minutes though. There is no dust in or by the fan. Is the fan just going bad? It's about two years old.