I've setup my ATCS 840, and when left hand side panel is attached, the case produces a regular (but not continuous) low frequency humming noise. If I touch the side of the case or slide it backwards a little, the hum disappears..
All fans are standard as it was shipped, using the stock intel i7 heatsink.
Any coolermaster reps have a solution? Maybe some kind of rubber damping strip to go along the bottom lip between the main chassis and the panel?