A few years ago Antec had a run of bad fans. In fact, my wife's Sonata III was even packed with an extra fan, in case the one included had the problem (it didn't, so I got a free fan). Hers runs on any of the settings, whereas I believe the defective ones would not run on "low," like yours. I'm sure it will be fine on "medium," and not too noisy. If it is, I'm sure Antec will send you a new one, or just get a Scythe.