I have a Corsair C600W PSU that I stuck in my new build just a week ago. But tonight, the fan started making noise. It's not a crazy amount of noise, and only a little audible above the other fans, but it's definitely not correct. It'll go silent for a while, then suddenly start rattling again, then go silent again. Anyway, I RMA'd with Newegg, but when I calculated the shipping cost is says it'll be, get this, $18. After discounts and rebates, it only cost me about $32 to buy in the first place (around $70 normally). For less than the shipping cost, I can buy another 120 or 140mm fan and just replace it myself without two weeks of downtime on my new machine. I have technical skill, but I haven't taken apart a PSU before. Is it doable, or are these things Fort Knox to get into? I checked and the fan IS spinning, so should I even worry about it? It's only noise, no power losses or heat (so far).