I'm having a problem with my new ATCS 840 case and I'm wondering if others have this problem.
With both top fans on, I hear a low, humming vibration that goes in and out. It starts off weak for a second, becomes louder for a second, and then fades after another second. The vibration-humming repeats ad nauseam.
Theorizing that this was the fans vibration sine waves overlapping, I disconnected one top fan. The noise stopped. I then tried disconnecting just the other top fan and the noise stopped as well. The source of the vibrations is definitely the two fans throwing out different waves of vibration. This is probably normal and expected unless you had two fans that were exactly the same in every sense.
With my hand, I feel the vibrations through the left side of the case (the side you open to install components). If I push this side in with my hand so that it bows in rather than out, the noise is barely perceivable. If I remove the left side, the noise is gone--even with both tops fans powered.
I've tried many solutions to no avail. I reinstalled the top fans, making sure to evenly tighten the screws. I've tried tightening the screws and I've tried keeping them loose on both the fans and side panel. I've even tried keeping it running for a day in the hopes that the fan vibrations would eventually sync. Nothing has worked.
I'm beginning to think that all the reviews made my expectations too high and that this is normal; however, the case is almost silent with the side panel off. For owners of the ATCS 840, do you hear these vibrations?