The 2 fans at the top of my computer are causing a slight vibration which makes a whirring noise ever so slightly. I noticed this because when I put my hand firmly over the top of the computer the whirring noise stops completely. I was just wondering is this a faulty fan, just how the design of the case and fans are or nothing to worry about? The sound doesn't really bother me as it's not super loud or anything I'm just more curious if it's something concerning or not. I'm not super knowledgeable about this stuff.