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Quadra 630 Whining PSU

My beloved 630 has been unplugged for about a year until today.  When I plugged it in there was a faint whining noise coming from the capacitor.

Is this whine cause for concern or normal?  I honestly don't remember this whine before, but the wife and kids were out and the house was abnormally quite.

I unplugged it just in case.

 
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