computer case problem! what do you think?

over the weekend I bought a Antec builder series CS400 case from comp usa to put my old pc case here's are pics

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every thing seems cool but now it is vibrating almost un bareably
real noisy like. seems to be the sides (metal parts) If I put someting of moderate weight on the top of is it quiets it down but that sucks. Most of the reviews on the case have been pretty good. antec sells a kit of rubber gromets and such to make cases quieter but I'm afraid of sucking money into this thing and have it not fix the problem what do you think or suggest?

Looks like my case, but my case doesn't have that problem?

Maybe there's something loose...

Do you have a large fan? If so, perhaps it's not mounted properly

I have a simliar model Antec, the SLK2650-BQE and its not very noisey at all.

I would suggest this.

First, does it actually seem like the noise is coming from the side panels of the case? Does your case have the side intake location with the little entending chute or fan.

Also, does yours use the tool less side rails? Perhaps they aren't locked and are vibrating.

Also might want to check the fans. I think that case has a optional 80mm fan intake up front and probably comes standard with a 80mm exhaust fan in the back. Check make sure its not vibrating against the case.

Also, any other photos you can provide, especially of the front, would help.