Strange intermitten hum from tower (fan related?)

I'm hearing this weird hum that occurs every few seconds and last for about one second when the computer is under little load(as if coinciding with something that's rotating inside by computer). I think it may be one of the large fans located in the front, because they just kicked into a higher mode and then back and it disappeared. Anyone have any idea on how I may repair these fans to get rid of this noise?

With much concern, I loaded smc fan control 2.2.2,
I can now get temp down to 134 - 136 degrees vs 174 with rpm settings of CPU_memory, IO, & exhaust set to roughly 1050 -1100 and not have fans make an impact on noise increase.
It was silent before, and now slight noise is present.
With a fresh restart, it doesn't take long to get up to 174 w/o any involved apps running.
It seems to be an issue with the PS (power-supply) with trying to increase it's fan rpm.
Regardless of setting, it will not budge over 740 rpm.
The speculation that the hum that varied from silent to audible is correct in it's attempt to increase the PS fan speed must be the culprit.
Still seems odd it shows 740 rpm, yet setting the speed to max won't take.
May have to do the hardware test to verify findings.
It would be interesting if others had to take this step as well.
Thanks'

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