Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
Probably from the pump, could mean its on its way out. Fairly certain they accept RMA if the pump is buzzing...
Some come out of the box like that unfortunately, get in touch with corsair and see what they have to say.