Wierd noise :(

[ombadboy]

Ok.. my first post, with a problem..

just got my powerball a few weeks ago, but it makes a wierd noise :( Not the smooth noise that u normally hear, but a wierd kidna cracking/rattling one (dunno actually how to describe it cuz my english is poor)..

I doubt it has collected any dust, since its brand new, and hasnt been dropped to the floor..

any clues?

[Sayex]

the same thing happend to me when i replace a new rotor, it was like knocking, i think thats just the technique you are using.
but when i go for faster rpms the knocking sound stops and it feels smooth again ^_^