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The fans that go first are usually the silly little ones they fit to graphics cards and to the bridge chips on the motherboards. Sometimes you can peel the labels off and drip a tiny amount of fine oil (I use watch and clock makers oil [aka lark oil]) onto the bearing before sealing it up again. Best way to find the culprit is with a soft paintbrush to stop the fan for a second - stopping the fan any other way can break the blades.
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