Loud Humming Noise from DVR



Today I noticed that two of my DVR's have developed a loud humming noise. I've restarted both and no change. I unplugged both and waiting about five minutes before plugging in again, still have the humming. Both DVR's have been silent since installed a few years ago and problem free. Should they be replaced before they fail or did they recently purform a firmware update to cause this?

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