Strange why nobody has mention warranty. Is it still under warranty?
If it is just call M$ and they'll send you a new one. I did and 4 days later I got a new one. My original was the crapy 2 pin version. They blow the heat out more by increasing the fan speed inside the power supply but if you've got good hearing you'll notice as it sucks in more air it makes a high pitched whistling sound. Bloody anoying. my new one is the 3 pin much quieter (IMG:
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Which one do you have?