Ok , Well i didnt read through ALL the idea's , one thing I didnt see mentioned was to grease/oil the fans you allready have ( if possible ). If they have a sticker on the center, peel it back and if underneath the sticker you see an open hole with the fan blade pole in there, put in a drop or two of sewing machine ( 5 in 1 ) oil . This way if its the bearings that are causing the noise, it'll stop.
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