There is a common problem with the first revision of those fans. I have one too that has this problem. The metal case shorts out the windings in the corners if you use metal bolts OR if you tighten the thing down too tight. You can slip a piece of electrical tape under the casing/above the windings in the corners and/or you can use nylon bolts and don't tighten it as much.
Some of them also had a problem on startup of needing to draw too much current and burning the leads or the motherboard fan header. I would use an adapter and attach it to a regular 4 pin power connector to be safe.
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