So I have Fractal Design R5 case. And I recently noticed it how has resonating hum that is osculating I tried few times to track down where it coming from with no success OCD is bitch atlest when it triggered. I have tried stopping ALL fan one at time to see if there causing it and none of them are causing it, one fan I cant do that to is PSU fan cause it in cased, but resonating hum not really loud by psu so I dont "think" it coming from psu. Took out the HDD(had this out for years)/Optical cage took this out today. it might made quieter?? as it not that bad right now. it mostly noticable from the GPU area and up. At one point I thought it was coming from case Fan covers cause if I put little weight on the covers it got quiter, the sound was still there though, but now that dont work. At one point the resonating hum was so bad I could hear from my bed bought 8 feet away I hear mostly when I sitting next to it now. The only thing I sure of is the moment the system is turned off it stops maybe it whine from something on the mb? i mean kind sound like transform whine but it dont at the same time and seeing all the fan are running fixed speed I cant see how it a fan cause it would same tone and the frequency of the resonating hum is osculating. and only thing I can think of that does that is coil whine depend on power going threw it. which if something from MB then I guess there not much I can do. Anyone have thought I what I should try?