Before you go and start replacing things like fans and power supplies, make sure it isn't in fact, just a wonky fan.
Once the humming starts, manually stop each one of your fans to see if it's the trouble maker. By "stop" I mean, stick your finger in there (it won't hurt) and determine which fan is making the noise. If you don't find a bad/noisy fan, replace the PS.
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The Truth:
Johnny Cash could have kicked Bruce Lee's ass if he wanted to.
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