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Question: when on carpet setting and on carpet is this typical?

Is it typical for the Dyson DC14 to make a horrible noise on carpeting... I have triple checked it and it's set on the setting for carpets. It makes a noise that would lead you to think something is caught on the rotary brush or else the carpeting is to plush. I've looked to see if something from the factory was down there but there's nothing visible. I don't have shag carpeting or even very thick carpeting. This is a brand new machine and I am a first time user. I have no clue what is causing this. I'm quite disgusted with this vacuum and am ready to return it!